Nissan Xterra OBD2 Codes: Your Guide to Decoding Check Engine Lights

Encountering a check engine light in your Nissan Xterra can be unsettling. Modern vehicles like the Nissan Xterra are equipped with an On-Board Diagnostic system, or OBD2, which monitors various systems and illuminates the check engine light when it detects an issue. Understanding Nissan Xterra Obd2 Codes is the first step in diagnosing and resolving these problems, potentially saving you time and money on unnecessary repairs.

This comprehensive guide delves into common powertrain-related OBD2 codes that your Nissan Xterra might display. While not every code will be specific to Nissan, this information will empower you to understand the potential issues affecting your vehicle, especially those related to fuel and air metering.

Understanding OBD2 Codes on Your Nissan Xterra

The OBD2 system is standardized across most vehicles sold in North America from 1996 onwards, including the Nissan Xterra. When a sensor detects a reading outside of normal parameters, it triggers a Diagnostic Trouble Code (DTC). These codes are alphanumeric and provide a starting point for diagnosing vehicle problems.

OBD2 codes are generally formatted with a letter followed by four numbers. The first letter indicates the system:

• P: Powertrain (Engine, Transmission)
• C: Chassis (Brakes, Suspension, Steering)
• B: Body (Interior, Airbags, Accessories)
• U: Network/Communication

The first number after the letter indicates the code type (e.g., generic or manufacturer-specific), and the subsequent numbers narrow down the specific system and component involved.

For Nissan Xterra owners, powertrain codes (P-codes) are frequently encountered, often related to engine performance, emissions, and fuel efficiency. Using an OBD2 scanner, you can retrieve these codes and begin to understand what might be causing your check engine light to illuminate.

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Alt text: Check engine light illuminated on a Nissan Xterra dashboard, indicating potential OBD2 fault codes.

Nissan Xterra OBD2 Powertrain Codes: P0001-P0099 (Fuel and Air Metering and Auxiliary Emission Controls)

The P0001 to P0099 range of OBD2 codes generally pertains to Fuel and Air Metering and Auxiliary Emission Controls. These codes can indicate problems with various components essential for engine operation and emission control within your Nissan Xterra. Here’s a breakdown of codes in this range:

• P0001 Fuel Volume Regulator Control Circuit/Open: Indicates an issue with the fuel volume regulator control circuit, potentially affecting fuel delivery to the engine.
• P0002 Fuel Volume Regulator Control Circuit Range/Performance: Suggests the fuel volume regulator circuit is not performing within the expected range, impacting fuel pressure and engine performance.
• P0003 Fuel Volume Regulator Control Circuit Low: Signals a low voltage condition in the fuel volume regulator control circuit, possibly due to wiring issues or a faulty regulator.
• P0004 Fuel Volume Regulator Control Circuit High: Indicates a high voltage condition in the fuel volume regulator control circuit, potentially caused by a short circuit or regulator malfunction.
• P0005 Fuel Shutoff Valve “A” Control Circuit/Open: Points to an open or broken circuit in the fuel shutoff valve “A” control system, which could prevent proper fuel flow shutoff.
• P0006 Fuel Shutoff Valve “A” Control Circuit Low: Signals a low voltage issue in the fuel shutoff valve “A” control circuit, potentially due to wiring problems or a faulty valve.
• P0007 Fuel Shutoff Valve “A” Control Circuit High: Indicates a high voltage condition in the fuel shutoff valve “A” control circuit, possibly caused by a short circuit or valve malfunction.
• P0008 Engine Positions System Performance Bank 1: Suggests a performance issue with the engine position system for Bank 1, which could involve camshaft or crankshaft position sensors.
• P0009 Engine Position System Performance Bank 2: Similar to P0008, but for Bank 2 of the engine, indicating potential problems with position sensors.
• P0010 “A” Camshaft Position Actuator Circuit (Bank 1): Indicates a malfunction in the circuit controlling the “A” camshaft position actuator for Bank 1, affecting variable valve timing.
• P0011 “A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1): Suggests the camshaft timing is over-advanced in Bank 1, or there’s a performance issue with the system, potentially impacting engine efficiency and power.
• P0012 “A” Camshaft Position – Timing Over-Retarded (Bank 1): Indicates the camshaft timing is over-retarded in Bank 1, potentially leading to reduced engine performance and fuel economy.
• P0013 “B” Camshaft Position – Actuator Circuit (Bank 1): Similar to P0010, but for the “B” camshaft position actuator circuit in Bank 1.
• P0014 “B” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1): Similar to P0011, but for the “B” camshaft timing in Bank 1.
• P0015 “B” Camshaft Position -Timing Over-Retarded (Bank 1): Similar to P0012, but for the “B” camshaft timing in Bank 1.
• P0016 Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor A): Indicates a mismatch between the crankshaft and camshaft position sensor readings for Bank 1 Sensor A, suggesting timing chain or sensor issues.
• P0017 Crankshaft Position – Camshaft Position Correlation (Bank 1 Sensor B): Similar to P0016, but for Bank 1 Sensor B.
• P0018 Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor A): Similar to P0016, but for Bank 2 Sensor A.
• P0019 Crankshaft Position – Camshaft Position Correlation (Bank 2 Sensor B): Similar to P0016, but for Bank 2 Sensor B.
• P0020 “A” Camshaft Position Actuator Circuit (Bank 2): Similar to P0010, but for Bank 2.
• P0021 “A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 2): Similar to P0011, but for Bank 2.
• P0022 “A” Camshaft Position – Timing Over-Retarded (Bank 2): Similar to P0012, but for Bank 2.
• P0023 “B” Camshaft Position – Actuator Circuit (Bank 2): Similar to P0013, but for Bank 2.
• P0024 “B” Camshaft Position – Timing Over-Advanced or System Performance (Bank 2): Similar to P0014, but for Bank 2.
• P0025 “B” Camshaft Position – Timing Over-Retarded (Bank 2): Similar to P0015, but for Bank 2.
• P0026 Intake Valve Control Solenoid Circuit Range/Performance Bank 1: Indicates a range or performance issue with the intake valve control solenoid circuit for Bank 1, affecting valve timing and airflow.
• P0027 Exhaust Valve Control solenoid Circuit Range/Performance Bank 1: Similar to P0026, but for the exhaust valve control solenoid circuit in Bank 1.
• P0028 Intake valve Control Solenoid Circuit Range/Performance Bank 2: Similar to P0026, but for Bank 2.
• P0029 Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2: Similar to P0027, but for Bank 2.
• P0030 HO2S Heater Control Circuit (Bank 1 Sensor 1): Indicates a problem with the heater control circuit for the Heated Oxygen Sensor (HO2S) in Bank 1 Sensor 1, affecting sensor warm-up and accuracy.
• P0031 HO2S Heater Control Circuit Low (Bank 1 Sensor 1): Signals a low voltage condition in the HO2S heater control circuit for Bank 1 Sensor 1.
• P0032 HO2S Heater Control Circuit High (Bank 1 Sensor 1): Indicates a high voltage condition in the HO2S heater control circuit for Bank 1 Sensor 1.
• P0033 Turbo Charger Bypass Valve Control Circuit: If your Nissan Xterra is equipped with a turbocharger (depending on the model year and trim), this code indicates an issue with the turbocharger bypass valve control circuit.
• P0034 Turbo Charger Bypass Valve Control Circuit Low: Signals a low voltage condition in the turbocharger bypass valve control circuit.
• P0035 Turbo Charger Bypass Valve Control Circuit High: Indicates a high voltage condition in the turbocharger bypass valve control circuit.
• P0036 HO2S Heater Control Circuit (Bank 1 Sensor 2): Similar to P0030, but for Bank 1 Sensor 2.
• P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2): Similar to P0031, but for Bank 1 Sensor 2.
• P0038 HO2S Heater Control Circuit High (Bank 1 Sensor 2): Similar to P0032, but for Bank 1 Sensor 2.
• P0039 Turbo/Super Charger Bypass Valve Control Circuit Range/Performance: Indicates a performance issue with the turbocharger or supercharger bypass valve control circuit.
• P0040 Upstream Oxygen Sensors Swapped From Bank To Bank: Suggests the upstream oxygen sensors have been incorrectly swapped between banks, leading to incorrect readings.
• P0041 Downstream Oxygen Sensors Swapped From Bank To Bank: Similar to P0040, but for the downstream oxygen sensors.
• P0042 HO2S Heater Control Circuit (Bank 1 Sensor 3): Similar to P0030, but for Bank 1 Sensor 3 (if applicable, some Xterras may not have sensor 3).
• P0043 HO2S Heater Control Circuit Low (Bank 1 Sensor 3): Similar to P0031, but for Bank 1 Sensor 3.
• P0044 HO2S Heater Control Circuit High (Bank 1 Sensor 3): Similar to P0032, but for Bank 1 Sensor 3.
• P0050 HO2S Heater Control Circuit (Bank 2 Sensor 1): Similar to P0030, but for Bank 2 Sensor 1.
• P0051 HO2S Heater Control Circuit Low (Bank 2 Sensor 1): Similar to P0031, but for Bank 2 Sensor 1.
• P0052 HO2S Heater Control Circuit High (Bank 2 Sensor 1): Similar to P0032, but for Bank 2 Sensor 1.
• P0053 HO2S Heater Resistance (Bank 1, Sensor 1): Indicates an issue with the heater resistance of the HO2S in Bank 1 Sensor 1.
• P0054 HO2S Heater Resistance (Bank 1, Sensor 2): Similar to P0053, but for Bank 1 Sensor 2.
• P0055 HO2S Heater Resistance (Bank 1, Sensor 3): Similar to P0053, but for Bank 1 Sensor 3.
• P0056 HO2S Heater Control Circuit (Bank 2 Sensor 2): Similar to P0030, but for Bank 2 Sensor 2.
• P0057 HO2S Heater Control Circuit Low (Bank 2 Sensor 2): Similar to P0031, but for Bank 2 Sensor 2.
• P0058 HO2S Heater Control Circuit High (Bank 2 Sensor 2): Similar to P0032, but for Bank 2 Sensor 2.
• P0059 HO2S Heater Resistance (Bank 2, Sensor 1): Similar to P0053, but for Bank 2 Sensor 1.
• P0060 HO2S Heater Resistance (Bank 2, Sensor 2): Similar to P0053, but for Bank 2 Sensor 2.
• P0061 HO2S Heater Resistance (Bank 2 Sensor 3): Similar to P0053, but for Bank 2 Sensor 3.
• P0062 HO2S Heater Control Circuit (Bank 2 Sensor 3): Similar to P0030, but for Bank 2 Sensor 3.
• P0063 HO2S Heater Control Circuit Low (Bank 2 Sensor 3): Similar to P0031, but for Bank 2 Sensor 3.
• P0064 HO2S Heater Control Circuit High (Bank 2 Sensor 3): Similar to P0032, but for Bank 2 Sensor 3.
• P0065 Air Assisted Injector Control Range/Performance: Indicates a range or performance issue with the air-assisted injector control system (if equipped).
• P0066 Air Assisted Injector Control Circuit or Circuit Low: Signals a problem with the air-assisted injector control circuit, possibly a low voltage condition.
• P0067 Air Assisted Injector Control Circuit High: Indicates a high voltage condition in the air-assisted injector control circuit.
• P0068 MAP/MAF – Throttle Position Correlation: Suggests a correlation issue between the Manifold Absolute Pressure (MAP) or Mass Air Flow (MAF) sensor and the Throttle Position Sensor (TPS), potentially affecting air-fuel mixture calculations.
• P0069 Manifold Absolute Pressure – Barometric Pressure Correlation: Indicates a correlation problem between the MAP sensor and the Barometric Pressure sensor, which can impact altitude compensation and engine performance.
• P0070 Ambient Air Temperature Sensor Circuit: Signals a malfunction in the ambient air temperature sensor circuit, which is used for climate control and sometimes engine management.
• P0071 Ambient Air Temperature Sensor Range/Performance: Indicates the ambient air temperature sensor is not performing within the expected range.
• P0072 Ambient Air Temperature Sensor Circuit Low Input: Signals a low input voltage from the ambient air temperature sensor circuit.
• P0073 Ambient Air Temperature Sensor Circuit High Input: Indicates a high input voltage from the ambient air temperature sensor circuit.
• P0074 Ambient Air Temperature Sensor Circuit Intermittent: Suggests an intermittent signal from the ambient air temperature sensor circuit.
• P0075 Intake Valve Control Solenoid Circuit (Bank 1): Similar to P0026, but specifically indicating a circuit issue (not range/performance).
• P0076 Intake Valve Control Solenoid Circuit Low (Bank 1): Signals a low voltage condition in the intake valve control solenoid circuit for Bank 1.
• P0077 Intake Valve Control Solenoid Circuit High (Bank 1): Indicates a high voltage condition in the intake valve control solenoid circuit for Bank 1.
• P0078 Exhaust Valve Control Solenoid Circuit (Bank 1): Similar to P0027, but specifically indicating a circuit issue.
• P0079 Exhaust Valve Control Solenoid Circuit Low (Bank 1): Signals a low voltage condition in the exhaust valve control solenoid circuit for Bank 1.
• P0080 Exhaust Valve Control Solenoid Circuit High (Bank 1): Indicates a high voltage condition in the exhaust valve control solenoid circuit for Bank 1.
• P0081 Intake valve Control Solenoid Circuit (Bank 2): Similar to P0075, but for Bank 2.
• P0082 Intake Valve Control Solenoid Circuit Low (Bank 2): Signals a low voltage condition in the intake valve control solenoid circuit for Bank 2.
• P0083 Intake Valve Control Solenoid Circuit High (Bank 2): Indicates a high voltage condition in the intake valve control solenoid circuit for Bank 2.
• P0084 Exhaust Valve Control Solenoid Circuit (Bank 2): Similar to P0078, but for Bank 2.
• P0085 Exhaust Valve Control Solenoid Circuit Low (Bank 2): Signals a low voltage condition in the exhaust valve control solenoid circuit for Bank 2.
• P0086 Exhaust Valve Control Solenoid Circuit High (Bank 2): Indicates a high voltage condition in the exhaust valve control solenoid circuit for Bank 2.
• P0087 Fuel Rail/System Pressure – Too Low: Suggests the fuel pressure in the fuel rail or system is lower than expected, potentially causing lean running conditions.
• P0088 Fuel Rail/System Pressure – Too High: Indicates the fuel pressure in the fuel rail or system is higher than expected, potentially causing rich running conditions.
• P0089 Fuel Pressure Regulator 1 Performance: Suggests a performance issue with fuel pressure regulator 1, affecting the ability to maintain correct fuel pressure.
• P0090 Fuel Pressure Regulator 1 Control Circuit: Indicates a malfunction in the control circuit for fuel pressure regulator 1.
• P0091 Fuel Pressure Regulator 1 Control Circuit Low: Signals a low voltage condition in the control circuit for fuel pressure regulator 1.
• P0092 Fuel Pressure Regulator 1 Control Circuit High: Indicates a high voltage condition in the control circuit for fuel pressure regulator 1.
• P0093 Fuel System Leak Detected – Large Leak: Signals a significant fuel leak in the fuel system, which can be a safety hazard and affect fuel pressure.
• P0094 Fuel System Leak Detected – Small Leak: Indicates a minor fuel leak in the system.
• P0095 Intake Air Temperature Sensor 2 Circuit: Similar to P0070, but for Intake Air Temperature Sensor 2 (if equipped).
• P0096 Intake Air Temperature Sensor 2 Circuit Range/Performance: Similar to P0071, but for Intake Air Temperature Sensor 2.
• P0097 Intake Air Temperature Sensor 2 Circuit Low: Similar to P0072, but for Intake Air Temperature Sensor 2.
• P0098 Intake Air Temperature Sensor 2 Circuit High: Similar to P0073, but for Intake Air Temperature Sensor 2.
• P0099 Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic: Similar to P0074, but for Intake Air Temperature Sensor 2.

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Alt text: An OBD2 scanner tool plugged into the OBD2 port of a Nissan Xterra, displaying diagnostic codes.

Nissan Xterra OBD2 Powertrain Codes: P0100-P0199 (Fuel and Air Metering)

The P0100 to P0199 range of OBD2 codes also focuses on Fuel and Air Metering, covering sensors and circuits directly related to measuring and controlling the air and fuel mixture entering your Nissan Xterra’s engine. These codes are crucial for maintaining optimal engine performance, fuel efficiency, and emissions.

• P0100 Mass or Volume Air Flow Circuit Malfunction: Indicates a general malfunction in the Mass Air Flow (MAF) or Volume Air Flow (VAF) sensor circuit.
• P0101 Mass or Volume Air Flow Circuit Range/Performance Problem: Suggests the MAF or VAF sensor readings are outside the expected range or not performing correctly, potentially leading to incorrect air-fuel mixture.
• P0102 Mass or Volume Air Flow Circuit Low Input: Signals a low voltage input from the MAF or VAF sensor circuit, which could indicate a sensor or wiring issue.
• P0103 Mass or Volume Air Flow Circuit High Input: Indicates a high voltage input from the MAF or VAF sensor circuit, potentially due to a short circuit or sensor fault.
• P0104 Mass or Volume Air Flow Circuit Intermittent: Suggests an intermittent signal from the MAF or VAF sensor circuit, which can cause sporadic engine performance issues.
• P0105 Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction: Indicates a general malfunction in the Manifold Absolute Pressure (MAP) or Barometric Pressure sensor circuit.
• P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem: Suggests the MAP or Barometric Pressure sensor readings are outside the expected range or not performing correctly, affecting air-fuel mixture and altitude compensation.
• P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input: Signals a low voltage input from the MAP or Barometric Pressure sensor circuit.
• P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input: Indicates a high voltage input from the MAP or Barometric Pressure sensor circuit.
• P0109 Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent: Suggests an intermittent signal from the MAP or Barometric Pressure sensor circuit.
• P0110 Intake Air Temperature Circuit Malfunction: Indicates a general malfunction in the Intake Air Temperature (IAT) sensor circuit.
• P0111 Intake Air Temperature Circuit Range/Performance Problem: Suggests the IAT sensor readings are outside the expected range or not performing correctly, affecting air-fuel mixture and engine timing.
• P0112 Intake Air Temperature Circuit Low Input: Signals a low voltage input from the IAT sensor circuit.
• P0113 Intake Air Temperature Circuit High Input: Indicates a high voltage input from the IAT sensor circuit.
• P0114 Intake Air Temperature Circuit Intermittent: Suggests an intermittent signal from the IAT sensor circuit.
• P0115 Engine Coolant Temperature Circuit Malfunction: Indicates a general malfunction in the Engine Coolant Temperature (ECT) sensor circuit.
• P0116 Engine Coolant Temperature Circuit Range/Performance Problem: Suggests the ECT sensor readings are outside the expected range or not performing correctly, affecting engine temperature monitoring and cooling fan operation.
• P0117 Engine Coolant Temperature Circuit Low Input: Signals a low voltage input from the ECT sensor circuit.
• P0118 Engine Coolant Temperature Circuit High Input: Indicates a high voltage input from the ECT sensor circuit.
• P0119 Engine Coolant Temperature Circuit Intermittent: Suggests an intermittent signal from the ECT sensor circuit.
• P0120 Throttle Position Sensor/Switch A Circuit Malfunction: Indicates a general malfunction in the Throttle Position Sensor (TPS) or switch “A” circuit.
• P0121 Throttle Position Sensor/Switch A Circuit Range/Performance Problem: Suggests the TPS or switch “A” readings are outside the expected range or not performing correctly, affecting throttle control and engine response.
• P0122 Throttle Position Sensor/Switch A Circuit Low Input: Signals a low voltage input from the TPS or switch “A” circuit.
• P0123 Throttle Position Sensor/Switch A Circuit High Input: Indicates a high voltage input from the TPS or switch “A” circuit.
• P0124 Throttle Position Sensor/Switch A Circuit Intermittent: Suggests an intermittent signal from the TPS or switch “A” circuit.
• P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control: Indicates the engine coolant temperature is too low to enter closed-loop fuel control, potentially affecting fuel efficiency and emissions.
• P0126 Insufficient Coolant Temperature for Stable Operation: Suggests the engine coolant temperature is too low for stable engine operation.
• P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature): Indicates the coolant temperature is below the thermostat’s regulating temperature, possibly due to a faulty thermostat.
• P0130 02 Sensor Circuit Malfunction (Bank I Sensor 1): Indicates a general malfunction in the Oxygen (O2) sensor circuit for Bank 1 Sensor 1.
• P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I): Signals a low voltage reading from the O2 sensor circuit for Bank 1 Sensor 1, suggesting a lean condition or sensor issue.
• P0132 02 Sensor Circuit High Voltage (Bank I Sensor 1): Indicates a high voltage reading from the O2 sensor circuit for Bank 1 Sensor 1, suggesting a rich condition or sensor issue.
• P0133 02 Sensor Circuit Slow Response (Bank 1 Sensor 1): Suggests the O2 sensor for Bank 1 Sensor 1 is responding slowly to changes in exhaust gas composition, affecting fuel control accuracy.
• P0134 02 Sensor Circuit No Activity Detected (Bank I Sensor 1): Indicates no activity detected from the O2 sensor circuit for Bank 1 Sensor 1, potentially due to a sensor failure or wiring problem.
• P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1): Indicates a malfunction in the heater circuit for the O2 sensor in Bank 1 Sensor 1.
• P0136 02 Sensor Circuit Malfunction (Bank I Sensor 2): Similar to P0130, but for Bank 1 Sensor 2.
• P0137 02 Sensor Circuit Low Voltage (Bank I Sensor 2): Similar to P0131, but for Bank 1 Sensor 2.
• P0138 02 Sensor Circuit High Voltage (Bank I Sensor 2): Similar to P0132, but for Bank 1 Sensor 2.
• P0139 02 Sensor Circuit Slow Response (Bank 1 Sensor 2): Similar to P0133, but for Bank 1 Sensor 2.
• P0140 02 Sensor Circuit No Activity Detected (Bank 1 Sensor 2): Similar to P0134, but for Bank 1 Sensor 2.
• P0141 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2): Similar to P0135, but for Bank 1 Sensor 2.
• P0142 02 Sensor Circuit Malfunction (Bank I Sensor 3): Similar to P0130, but for Bank 1 Sensor 3 (if applicable).
• P0143 02 Sensor Circuit Low Voltage (Bank I Sensor 3): Similar to P0131, but for Bank 1 Sensor 3.
• P0144 02 Sensor Circuit High Voltage (Bank I Sensor 3): Similar to P0132, but for Bank 1 Sensor 3.
• P0145 02 Sensor Circuit Slow Response (Bank 1 Sensor 3): Similar to P0133, but for Bank 1 Sensor 3.
• P0146 02 Sensor Circuit No Activity Detected (Bank I Sensor 3): Similar to P0134, but for Bank 1 Sensor 3.
• P0147 02 Sensor Heater Circuit Malfunction (Bank I Sensor 3): Similar to P0135, but for Bank 1 Sensor 3.
• P0150 02 Sensor Circuit Malfunction (Bank 2 Sensor I): Similar to P0130, but for Bank 2 Sensor 1.
• P0151 02 Sensor Circuit Low Voltage (Bank 2 Sensor I): Similar to P0131, but for Bank 2 Sensor 1.
• P0152 02 Sensor Circuit High Voltage (Bank 2 Sensor 1): Similar to P0132, but for Bank 2 Sensor 1.
• P0153 02 Sensor Circuit Slow Response (Bank 2 Sensor 1): Similar to P0133, but for Bank 2 Sensor 1.
• P0154 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1): Similar to P0134, but for Bank 2 Sensor 1.
• P0155 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1): Similar to P0135, but for Bank 2 Sensor 1.
• P0156 02 Sensor Circuit Malfunction (Bank 2 Sensor 2): Similar to P0130, but for Bank 2 Sensor 2.
• P0157 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2): Similar to P0131, but for Bank 2 Sensor 2.
• P0158 02 Sensor Circuit High Voltage (Bank 2 Sensor 2): Similar to P0132, but for Bank 2 Sensor 2.
• P0159 02 Sensor Circuit Slow Response (Bank 2 Sensor 2): Similar to P0133, but for Bank 2 Sensor 2.
• P0160 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 2): Similar to P0134, but for Bank 2 Sensor 2.
• P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2): Similar to P0135, but for Bank 2 Sensor 2.
• P0162 02 Sensor Circuit Malfunction (Bank 2 Sensor 3): Similar to P0130, but for Bank 2 Sensor 3 (if applicable).
• P0163 02 Sensor Circuit Low Voltage (Bank 2 Sensor 3): Similar to P0131, but for Bank 2 Sensor 3.
• P0164 02 Sensor Circuit High Voltage (Bank 2 Sensor 3): Similar to P0132, but for Bank 2 Sensor 3.
• P0165 02 Sensor Circuit Slow Response (Bank 2 Sensor 3): Similar to P0133, but for Bank 2 Sensor 3.
• P0166 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 3): Similar to P0134, but for Bank 2 Sensor 3.
• P0167 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3): Similar to P0135, but for Bank 2 Sensor 3.
• P0170 Fuel Trim Malfunction (Bank 1): Indicates a general fuel trim malfunction for Bank 1, suggesting the engine control unit (ECU) is having difficulty adjusting the air-fuel mixture.
• P0171 System too Lean (Bank 1): Suggests the air-fuel mixture in Bank 1 is too lean (too much air, not enough fuel). This can be caused by vacuum leaks, fuel delivery issues, or sensor problems.
• P0172 System too Rich (Bank 1): Indicates the air-fuel mixture in Bank 1 is too rich (too much fuel, not enough air). This can be caused by fuel injector problems, faulty sensors, or exhaust restrictions.
• P0173 Fuel Trim Malfunction (Bank 2): Similar to P0170, but for Bank 2.
• P0174 System too Lean (Bank 2): Similar to P0171, but for Bank 2.
• P0175 System too Rich (Bank 2): Similar to P0172, but for Bank 2.
• P0176 Fuel Composition Sensor Circuit Malfunction: Indicates a malfunction in the fuel composition sensor circuit (if equipped, often for flex-fuel vehicles).
• P0177 Fuel Composition Sensor Circuit Range/Performance: Suggests the fuel composition sensor readings are outside the expected range or not performing correctly.
• P0178 Fuel Composition Sensor Circuit Low Input: Signals a low voltage input from the fuel composition sensor circuit.
• P0179 Fuel Composition Sensor Circuit High Input: Indicates a high voltage input from the fuel composition sensor circuit.
• P0180 Fuel Temperature Sensor A Circuit Malfunction: Indicates a general malfunction in the Fuel Temperature Sensor “A” circuit.
• P0181 Fuel Temperature Sensor A Circuit Range/Performance: Suggests the Fuel Temperature Sensor “A” readings are outside the expected range or not performing correctly.
• P0182 Fuel Temperature Sensor A Circuit Low Input: Signals a low voltage input from the Fuel Temperature Sensor “A” circuit.
• P0183 Fuel Temperature Sensor A Circuit High Input: Indicates a high voltage input from the Fuel Temperature Sensor “A” circuit.
• P0184 Fuel Temperature Sensor A Circuit Intermittent: Suggests an intermittent signal from the Fuel Temperature Sensor “A” circuit.
• P0185 Fuel Temperature Sensor B Circuit Malfunction: Similar to P0180, but for Fuel Temperature Sensor “B” (if equipped).
• P0186 Fuel Temperature Sensor B Circuit Range/Performance: Similar to P0181, but for Fuel Temperature Sensor “B”.
• P0187 Fuel Temperature Sensor B Circuit Low Input: Similar to P0182, but for Fuel Temperature Sensor “B”.
• P0188 Fuel Temperature Sensor B Circuit High Input: Similar to P0183, but for Fuel Temperature Sensor “B”.
• P0189 Fuel Temperature Sensor B Circuit Intermittent: Similar to P0184, but for Fuel Temperature Sensor “B”.
• P0190 Fuel Rail Pressure Sensor Circuit Malfunction: Indicates a general malfunction in the Fuel Rail Pressure Sensor circuit.
• P0191 Fuel Rail Pressure Sensor Circuit Range/Performance: Suggests the Fuel Rail Pressure Sensor readings are outside the expected range or not performing correctly.
• P0192 Fuel Rail Pressure Sensor Circuit Low Input: Signals a low voltage input from the Fuel Rail Pressure Sensor circuit.
• P0193 Fuel Rail Pressure Sensor Circuit High Input: Indicates a high voltage input from the Fuel Rail Pressure Sensor circuit.
• P0194 Fuel Rail Pressure Sensor Circuit Intermittent: Suggests an intermittent signal from the Fuel Rail Pressure Sensor circuit.
• P0195 Engine Oil Temperature Sensor Malfunction: Indicates a general malfunction in the Engine Oil Temperature Sensor circuit.
• P0196 Engine Oil Temperature Sensor Range/Performance: Suggests the Engine Oil Temperature Sensor readings are outside the expected range or not performing correctly.
• P0197 Engine Oil Temperature Sensor Low: Signals a low reading from the Engine Oil Temperature Sensor.
• P0198 Engine Oil Temperature Sensor High: Indicates a high reading from the Engine Oil Temperature Sensor.
• P0199 Engine Oil Temperature Sensor Intermittent: Suggests an intermittent signal from the Engine Oil Temperature Sensor circuit.

What to Do When You See an OBD2 Code on Your Nissan Xterra

When your Nissan Xterra displays a check engine light and you retrieve an OBD2 code, it’s crucial to take appropriate steps:

1. Record the Code: Write down the exact code and any freeze frame data provided by your scanner. This information is valuable for diagnosis.
2. Research the Code: Use resources like this guide and reputable online databases to understand the potential causes and symptoms associated with the code.
3. Visual Inspection: Check for obvious issues such as loose gas caps, vacuum leaks, damaged wiring, or disconnected sensors.
4. Address Simple Issues: If you identify a simple fix (e.g., tightening the gas cap), address it and clear the code with your scanner. See if the check engine light returns.
5. Seek Professional Diagnosis: For more complex codes or if the check engine light reappears, it’s best to consult a qualified mechanic. They have the tools, expertise, and experience to accurately diagnose and repair the issue affecting your Nissan Xterra.

Understanding Nissan Xterra OBD2 codes empowers you to be a more informed vehicle owner. While this guide provides a starting point, professional diagnosis is crucial for accurate repairs and maintaining the long-term health of your Nissan Xterra.

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Alt text: A detailed view of a Nissan Xterra engine bay, showcasing components related to fuel and air intake systems.

Source: Codes