My brother rolled up with a check engine light blazing on his dashboard and a rather imposing device in hand. It was the Konnwei KW850 OBD2 scanner, and my inner DIY mechanic immediately perked up. Having never seen this particular model before, my curiosity was ignited. What exactly was this substantial-looking code reader capable of?
He mentioned it was a basic code reader, which only deepened my intrigue. Why such a large footprint for a tool performing fundamental diagnostics? I knew right then I had to get my hands on the Konnwei KW850 and put it through its paces. After a week of testing, here are my comprehensive thoughts.
Let’s dive straight into this Konnwei KW850 review and see if this scanner lives up to its robust appearance.
Konnwei KW850 Review: Initial Impressions and Unboxing
When my brother first presented the Konnwei KW850, my initial thought was, “Is that some kind of heavy-duty gadget?” Its sheer size is undeniably the first thing you notice. It’s by far the largest basic OBD2 code reader I’ve encountered. At first glance, you might mistake it for a high-end, all-system scanner packed with advanced functionalities.
The robust build and substantial feel definitely give off a “badass” vibe. Even after learning it was a basic code reader, I still held onto the hope that its size hinted at hidden depths. I couldn’t wait to plug it into my car’s OBD2 port and see what it could actually do.
Holding the KW850 for the first time, I was struck by its weight – it felt solid and well-built, reminiscent of the sturdy Foxwell ST203. My brother handed over the packaging contents, which were quite straightforward:
- Eco-friendly cardboard box
- User manual
- Protective carrying pouch
- The Konnwei KW850 scanner itself
A hand holding the Konnwei KW850 OBD2 scanner, emphasizing its considerable size and robust design.
Konnwei KW850 Functions and Capabilities
Given its size, I went into testing the Konnwei KW850 with fairly high expectations. However, plugging it into my vehicle’s OBD II port quickly grounded those expectations in reality. While it’s not the all-singing, all-dancing diagnostic tool its size might suggest, it capably handles essential OBD2 functions:
1. Basic OBD2 Code Reading and Clearing
The primary function of any OBD2 scanner is to read and clear diagnostic trouble codes (DTCs). When your car’s computer (ECU) detects an issue, it triggers a DTC and often illuminates the check engine light. The Konnwei KW850 excels at this fundamental task. It quickly retrieves these codes, giving you a starting point for diagnosing the problem.
The DTCs themselves are essentially coded messages that require interpretation. Fortunately, the KW850 includes a helpful DTC lookup feature (discussed below). Once you’ve addressed the underlying issue causing the code, the KW850 allows you to clear the codes, turning off the check engine light. This is crucial for confirming the repair and ensuring you’re alerted to new problems in the future.
2. DTC Lookup Function
For those unfamiliar with interpreting OBD2 codes, the DTC lookup feature is invaluable. The raw codes themselves can seem cryptic. This function within the Konnwei KW850 deciphers these codes, providing a plain-English explanation of what the code signifies.
This feature bridges the gap for non-professional users, making the diagnostic process much more accessible and understandable. Instead of just seeing a code like “P0171,” the DTC lookup provides context and potential causes.
3. Live Data Stream
Going beyond simple code reading, the Konnwei KW850 also offers live data streaming. This function allows you to monitor real-time data from your vehicle’s sensors and systems. Analyzing live data is often crucial for pinpointing intermittent issues or understanding the context surrounding a DTC.
For example, a “P0171 – System Too Lean (Bank 1)” code might indicate a vacuum leak. By examining live data, specifically the Mass Air Flow (MAF) sensor readings, you can assess if the airflow is within expected parameters for your engine size and operating conditions. Out-of-range values can help confirm suspicions of a leak or point to other potential problems. The KW850 provides this essential live data capability in a straightforward manner.
The Konnwei KW850 screen displaying live data stream readings, showcasing its ability to monitor real-time vehicle parameters.
Additional Features of the Konnwei KW850
Beyond the core OBD2 functionalities, the KW850 includes several useful supplementary features:
- I/M Readiness: Checks the status of your vehicle’s emissions systems, ensuring they are ready for emissions testing.
- EVAP System Test: Tests the Evaporative Emission Control System for leaks.
- O2 Sensor Test: Evaluates the performance of your oxygen sensors.
- Vehicle Information Retrieval: Displays your vehicle’s VIN, calibration IDs, and other important information.
- Data Review and Printing: Allows you to review saved DTCs, freeze frame data, and live data. You can also print this information if you connect the scanner to a computer.
These extra features add value and convenience, expanding the KW850’s utility beyond basic code reading and clearing.
Konnwei KW850 Vehicle Compatibility
The Konnwei KW850 boasts broad vehicle compatibility with most modern cars on the road today. During my testing, it worked seamlessly with various brands, makes, and models (excluding hybrids, electric vehicles, and sports cars). It’s designed to be compatible with all OBD II compliant vehicles.
It’s important to confirm your vehicle is OBD II certified, which is standard for most cars manufactured after 1996 in the US and later in other regions. If you’re unsure about your vehicle’s OBD standard or have an older OBD I vehicle, it’s advisable to check with Konnwei or your vehicle manufacturer for compatibility information.
For the vast majority of car owners driving non-exotic, gasoline-powered vehicles, the Konnwei KW850 should offer plug-and-play compatibility.
Battery Testing and OBD I Support
A standout feature of the Konnwei KW850 is its built-in battery testing capability. While not common in basic OBD2 code readers, this function allows you to conveniently test your car battery’s voltage and health directly through the OBD II port. This eliminates the need for separate battery testers and the hassle of accessing the battery terminals directly.
I verified the KW850’s battery readings with a multimeter and found them to be accurate. This integrated battery test is a valuable addition, particularly for diagnosing starting issues or monitoring battery health.
Furthermore, the Konnwei KW850 offers the rare ability to scan older OBD I vehicles. While OBD I vehicles are less common now, this backward compatibility is a significant advantage for owners of classic cars or those working on older vehicles. It provides a degree of versatility not found in many modern OBD2 scanners.
Konnwei KW850 Limitations
Despite its strengths, the Konnwei KW850 does have limitations that are important to consider:
1. Size – A Double-Edged Sword
The most obvious limitation is its size. While the robust build and large display are appealing, the sheer bulk of the KW850 can be cumbersome. It’s not as portable or easily stored as smaller OBD2 scanners. Furthermore, despite its size, it remains a basic code reader. It does not offer advanced functionalities like:
- Transmission diagnostics
- ABS diagnostics
- Airbag system diagnostics
- Bi-directional controls or actuation tests
- Advanced system scans
For all its physical presence, the KW850 is limited to basic OBD2 engine diagnostics and battery testing.
2. Detachable Cable – Potential Drawback
The detachable OBD2 cable can be both a pro and a con. Detaching the cable makes storage easier and potentially prolongs the lifespan of the cable by reducing strain. However, it also introduces the risk of misplacing the cable. Without the specific cable, the KW850 is unusable. Careful storage and cable management are necessary to avoid this inconvenience.
A closer view of the Konnwei KW850, highlighting the detachable OBD2 cable and the scanner’s port.
Konnwei KW850 Alternatives
If the Konnwei KW850 isn’t quite the right fit, several excellent alternatives are worth considering:
- Ancel AD410: A compact and reliable OBD2 scanner that I’ve personally used for years. It’s highly portable and covers the essential OBD2 functions effectively. If you prioritize portability over size and battery testing, the AD410 is a strong contender.
- Ancel AD410 Pro: An upgraded version of the AD410 that includes battery testing capabilities. It offers a similar feature set to the KW850 in a smaller form factor. If battery testing is desired but size is a concern, the AD410 Pro is a compelling alternative.
- Foxwell NT301: If you appreciate the larger size and display of the KW850 but want to explore other brands, the Foxwell NT301 is another substantial OBD2 scanner. It offers similar basic OBD2 functions but lacks the battery testing feature.
Should You Buy the Konnwei KW850?
The Konnwei KW850 OBD2 scanner occupies a unique niche. Its imposing size and robust build make a statement. If you appreciate a tool that feels substantial and enjoy the large display, the KW850 might appeal to you. The integrated battery testing and OBD I compatibility are genuinely useful features that set it apart from many basic code readers.
However, if portability is a priority, or if you’re primarily interested in basic OBD2 diagnostics without the need for battery testing or OBD I support, smaller and equally capable scanners like the Ancel AD410 or AD410 Pro might be more practical choices.
In conclusion, the Konnwei KW850 is a capable and feature-rich basic OBD2 scanner. It’s best suited for users who value its robust feel, large display, integrated battery test, and OBD I compatibility, and are less concerned about its bulkier size. If these features align with your needs, the Konnwei KW850 is a worthwhile tool to consider for your automotive diagnostic needs.
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Throttle Lan
DIY Mechanic & Auto Writer
With half a decade of hands-on experience fixing cars, I’m passionate about all things automotive. From engine rebuilds to electrical troubleshooting, I enjoy demystifying car repairs and sharing my knowledge with fellow DIY enthusiasts.
