Many vehicle owners use aftermarket devices like the Range Active Fuel Management (AFM) disabler to improve their car’s performance by preventing the engine from switching to fuel-saving cylinder deactivation mode. These devices plug into your car’s OBD2 port and are popular for enhancing driving experience. However, there’s a crucial factor to consider if you’re using a Range Technology Obd2 disabler, especially when it’s time for your vehicle’s emission test.
One truck owner recently shared their experience with a 2015 Sierra 2wd 4.3L V6. Prior to taking his truck for a routine state emission test, he unplugged his Range AFM disabler. The emission test, which involved reading sensors via the OBDII port, resulted in a failure. The report indicated that the O2 sensor and catalytic converter systems were “not completed.” Confused, the owner contacted Range Technology support to understand if the removal of the AFM disabler could be related to this unexpected failure.
Range Technology confirmed that the AFM disablers, while effective for their intended purpose, are not emissions approved and can indeed cause vehicles to fail emission tests. Their technical support explained that disabling and then re-enabling the AFM system resets the vehicle’s emissions readiness systems. This reset means that essential emission monitors, like those for the O2 sensors and catalytic converter, are not ready or haven’t completed their diagnostic cycles when tested immediately after removing the device.
To avoid emission test failures related to Range Technology OBD2 devices, it is recommended to drive your vehicle for 50-100 miles after removing the AFM disabler. This driving period allows the vehicle’s emissions systems to fully reset and complete their readiness checks. By ensuring your vehicle completes these cycles, you can confidently pass your emission test without issues caused by the temporary use of an AFM disabler. Always remember to consider the implications of aftermarket OBD2 devices on your vehicle’s emission system readiness.
