I’ll admit, my first encounter with the Konnwei KW850 OBD2 scanner was quite memorable. My brother showed up with this device that looked more like a power tool than a basic code reader. Being a DIY auto enthusiast, my curiosity was instantly piqued. I needed to get my hands on this thing and see what it was all about.
Despite being told it was a basic code reader, its sheer size made me question that. Why would a basic scanner be so large? I borrowed the Konnwei KW850 for a week to put it through its paces and share my honest review.
Let’s dive into the Konnwei KW850 OBD2 scanner and see if its size translates to performance and value.
Konnwei KW850 Review: Initial Thoughts and Unboxing
When my brother first presented the Konnwei KW850, my initial impression was that he was holding some sort of heavy-duty gadget. Honestly, for a moment, it looked more like a weapon than a diagnostic tool!
Its size is the most striking thing about it. It’s by far the largest basic OBD2 code reader I’ve ever used. At first glance, I assumed it was a high-end, comprehensive scanner capable of deep dives into all vehicle systems. Even after learning it was a basic model, that initial impression of robust capability stuck with me.
Holding it for the first time, the weight was noticeable – in a reassuring way. It felt solid and well-built, similar to the Foxwell ST203 I handled when comparing it to the ST201.
My brother had the packaging contents, and inside the box, you’ll find:
- Eco-friendly cardboard packaging.
- User manual.
- Protective carrying pouch.
- The Konnwei KW850 scanner unit itself.
Functions and Capabilities of the Konnwei KW850
Given its substantial size, I went into testing the Konnwei KW850 with high expectations. I anticipated a feature-rich device. Connecting it to my car’s OBD2 port brought me back to reality, revealing its true capabilities.
Here’s a breakdown of what the Konnwei KW850 can do:
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 detects an issue, it triggers a DTC and often illuminates the check engine light.
The Konnwei KW850 excels at this basic task. It quickly retrieves these codes, giving you a starting point for diagnosing the problem. These codes are essentially the car’s way of telling you what’s wrong.
More importantly, once you’ve addressed the underlying issue, the KW850 allows you to clear these codes, turning off the check engine light and ensuring your dashboard is free of distractions.
2. DTC Lookup Function
OBD2 codes can be cryptic, especially for those not deeply familiar with automotive diagnostics. A code like “P0300” might not mean much to the average car owner.
This is where the Konnwei KW850’s built-in DTC lookup feature becomes invaluable. Simply enter the code displayed by the scanner, and it provides a clear, concise explanation of what the code means. This feature takes the guesswork out of code interpretation, making it user-friendly for both beginners and experienced DIYers.
3. Live Data Stream Reading
Going beyond basic code reading, understanding live data streams is crucial for deeper diagnostics. Sometimes, a code is just a symptom, and live data reveals the root cause.
For example, a P0171 code (System Too Lean, Bank 1) indicates a lean condition, but doesn’t pinpoint the cause. By examining live data with the KW850, you can monitor parameters like air flow (grams per second – g/s). Comparing these values to expected ranges for your engine size helps identify issues like vacuum leaks causing unmetered air entry.
The Konnwei KW850 provides this essential live data streaming capability, which is often taken for granted but is vital for effective troubleshooting.
Additional Features
Beyond the core functions, the Konnwei KW850 includes several useful extra features:
- I/M Readiness: Checks the status of your vehicle’s emissions systems, ensuring they are ready for smog testing.
- EVAP System Test: Tests the evaporative emissions control system for leaks.
- O2 Sensor Test: Monitors the performance of your oxygen sensors.
- Vehicle Information (VIN): Retrieves your vehicle’s identification number and other vehicle-specific information.
- Review and Print Data: Allows you to review stored DTCs, freeze frame data, and live data streams. You can also print this information if you need a hard copy of your diagnostic results.
Konnwei KW850 Vehicle Compatibility
The Konnwei KW850 boasts broad vehicle compatibility. During my testing, it worked seamlessly with various brands, makes, and models of OBD2-compliant vehicles (excluding hybrids, electric cars, and sports cars).
It’s important to confirm your vehicle is OBD2 certified. The KW850 is designed for OBD2 systems, which became standard in most cars in the mid-1990s. If you have an older OBD1 vehicle, you should verify compatibility with Konnwei directly.
Generally, if you drive a non-exotic, gasoline-powered vehicle manufactured after the mid-90s, the Konnwei KW850 should work without issues.
Battery Testing and OBD1 Support
A standout feature of the Konnwei KW850 is its integrated battery testing capability. While not common in basic OBD2 scanners, this function allows you to test your battery voltage and health directly through the OBD2 port.
This is incredibly convenient, eliminating the need to access the battery terminals directly under the hood or in the trunk. I verified its accuracy against a multimeter, and the KW850 provided reliable readings.
Furthermore, the KW850 supports older OBD1 vehicles. While OBD1 cars are less common now, this backward compatibility is a significant advantage for those who work on or own classic cars, making this scanner more versatile than many competitors.
Limitations of the Konnwei KW850
Despite its features, the Konnwei KW850 has some drawbacks:
1. Size and Bulk
The most obvious limitation is its size. The KW850 is large and bulky, especially for a basic code reader. Despite its size, it doesn’t offer advanced functions like transmission, ABS, or airbag system scanning. For its size, you might expect more comprehensive diagnostic capabilities.
2. Detachable Cable: Blessing or Curse?
The detachable OBD2 cable can be seen as both a pro and a con. Detaching the cable makes storage easier and reduces wear and tear on the cable itself.
However, a detachable cable is also easier to lose. If you are prone to misplacing things, or if children have access to your tools, the cable could easily go missing, rendering the scanner useless until you find a replacement. Whether this is a benefit or a disadvantage depends on your personal habits and environment.
Konnwei KW850 Alternatives
If you’re considering the Konnwei KW850, it’s worth looking at some alternatives:
- Ancel AD410: A compact and reliable OBD2 scanner that I’ve personally used for years. It’s much smaller and more portable than the KW850 and offers similar basic functionality. For many users, the Ancel AD410 provides a better balance of size and features.
- Ancel AD410 Pro: An upgraded version of the AD410 that includes battery testing, similar to the KW850. It retains the compact size of the AD410 while adding the battery test function.
- Foxwell NT301: If you like the larger size of the KW850, the Foxwell NT301 is another sizeable option. While not quite as large as the KW850, it offers similar basic OBD2 functions but lacks the battery testing feature. Consider the Foxwell NT301 if you prefer a larger scanner but don’t need battery testing.
Should You Buy the Konnwei KW850 OBD2 Scanner?
The Konnwei KW850 OBD2 scanner is for those who appreciate a tool that makes a statement. Its large size and solid feel certainly give an impression of robustness and capability. If you like your tools to feel substantial and impressive, the KW850 might appeal to you.
However, if you prioritize practicality and portability, the Konnwei KW850 might be overkill. For basic code reading and clearing without the need for battery testing, the Ancel AD410 is a more convenient and compact alternative.
If battery testing is important to you, and you still prefer a smaller size, the Ancel AD410 Pro offers battery testing in a more portable package.
In conclusion, the Konnwei KW850 is a capable basic OBD2 scanner with added battery testing and OBD1 compatibility. Its large size is its most defining characteristic, which can be a pro or con depending on your preferences. If you want a large, robust-feeling scanner with battery testing and OBD1 support, the Konnwei KW850 is a viable option. But for most users, more compact and equally functional alternatives like the Ancel AD410 or AD410 Pro may be more practical choices.
Stay Tuned for More Automotive Reviews!
Throttle Lan
DIY Mechanic and Auto Writer
With half a decade of hands-on experience fixing cars, I’m passionate about all things automotive. From engine rebuilds to routine maintenance, I enjoy tackling any mechanical challenge. When I’m not in the garage, I share my automotive knowledge and experiences through writing.
