When my brother rolled up with a check engine light blazing on his dashboard and a hefty-looking device in hand, my inner gearhead perked up. It was the Konnwei KW850 OBD2 scanner, a tool I’d heard whispers about in online forums but never personally encountered. Being a DIY auto enthusiast, I was instantly intrigued. What was this sizable code reader all about?
He explained it was a basic code reader, which only deepened my curiosity. Why such a large footprint for a basic tool? I had to get my hands on it. So, I borrowed the Konnwei KW850 for a week, determined to put it through its paces and share a comprehensive Konnwei Obd2 Review. Here are my findings.
First, let’s get acquainted with the Konnwei KW850 OBD2 scanner.
Disclosure: As an Amazon Associate, I earn from qualifying purchases.
Konnwei KW850 Review: Initial Impressions and Unboxing
My first thought upon seeing the Konnwei KW850 was, “This thing is substantial!” It’s undeniably the largest basic OBD2 code reader I’ve ever come across. Honestly, when my brother first pulled it out, it looked more like a serious piece of diagnostic equipment than a simple code scanner.
The sheer size creates a bold and robust impression. Initially, I even imagined it was some high-end scanner capable of diving deep into all vehicle modules and performing advanced diagnostics. Even after my brother clarified its basic nature, I remained skeptical. Could a basic scanner really be this… big?
I needed to experience it firsthand, plugged into my own vehicle’s OBD2 port, to form a real Konnwei OBD2 review. Grabbing the KW850, the first thing I noticed was its weight. It felt solid and well-built, reminiscent of the robust feel of tools like the Foxwell ST203.
Upon unboxing, the Konnwei KW850 comes with:
- Eco-friendly cardboard packaging.
- Detailed user manual.
- Protective carrying pouch.
- The Konnwei KW850 scanner itself.
Konnwei KW850 Functions and Capabilities
Taking the Konnwei KW850 for a spin, my initial high expectations, fueled by its size, met reality. Plugging it into my car’s OBD2 port revealed its true capabilities. While it might not be the advanced diagnostic powerhouse I initially envisioned, the KW850 offers a solid set of functions for basic OBD2 diagnostics.
Here’s a breakdown of its key features for this Konnwei OBD2 review:
1. Basic OBD2 Code Reading and Clearing
The core function of any OBD2 scanner, and the Konnwei KW850 performs this reliably. When your vehicle’s computer (ECU) detects an issue, it triggers a Diagnostic Trouble Code (DTC), often illuminating the check engine light. The KW850 excels at quickly reading these codes, providing you with the crucial first step in understanding what’s ailing your vehicle.
These DTC codes are essentially the car’s way of communicating problems. While seemingly cryptic at first glance, they tell a story that can be unlocked with a DTC lookup. And once you’ve addressed the underlying issue, the Konnwei KW850 allows you to clear these codes, turning off the check engine light and giving you a clean slate to monitor for any new problems.
2. Built-in DTC Lookup
For those unfamiliar with DTC codes (and even for experienced DIYers who might encounter unfamiliar codes), the Konnwei KW850’s built-in DTC lookup is a lifesaver. Simply input the trouble code displayed by the scanner, and it provides a clear, concise explanation directly on the screen.
This feature is invaluable for making sense of the diagnostic process. Instead of having to search online databases or consult repair manuals, the KW850 puts the code definitions right at your fingertips, making car diagnostics more accessible to everyone. This is a strong point in this Konnwei OBD2 review.
3. Live Data Stream
Going beyond basic code reading, the Konnwei KW850 also offers live data streaming. This feature allows you to monitor real-time sensor data from your vehicle as it runs. This is crucial for diagnosing intermittent issues or understanding the context behind a trouble code.
For example, a “lean condition” code (like P0171) indicates an imbalance in the air-fuel mixture. While the code itself is informative, live data can pinpoint the root cause. By monitoring airflow readings (grams per second), you can compare them to expected values for your engine size and identify potential vacuum leaks or sensor malfunctions causing the lean condition. The KW850 provides this essential live data in an easy-to-read format.
Additional Konnwei KW850 Features
Beyond the core functions, the Konnwei KW850 packs in some useful extras:
- I/M Readiness: Checks the status of your vehicle’s emissions systems, ensuring they are ready for emissions testing.
- EVAP System Test: Diagnoses issues within the Evaporative Emission Control System, which prevents fuel vapor leaks.
- O2 Sensor Test: Evaluates the performance of your oxygen sensors, critical for fuel efficiency and emissions control.
- Vehicle Information (VIN) Retrieval: Quickly retrieves your vehicle’s VIN, useful for looking up parts or service information.
- Data Review and Print: Allows you to review saved diagnostic data and even print reports if connected to a computer, useful for record-keeping.
Konnwei KW850 Vehicle Compatibility
The Konnwei KW850 boasts broad vehicle compatibility, covering most modern cars and light trucks on the road today. During my Konnwei OBD2 review, I tested it on a range of vehicles from different brands and models (excluding hybrids, electric vehicles, and high-performance sports cars). In each case, the KW850 connected and functioned without any issues.
It’s important to note that all test vehicles were OBD2 compliant. If you own an older vehicle potentially equipped with OBD1, you should verify compatibility directly with Konnwei. However, for the vast majority of drivers with OBD2-compliant vehicles (generally post-1996 models in the US), the Konnwei KW850 should offer seamless compatibility.
Battery Testing and OBD1 Support: Standout Features
One surprising and valuable feature of the Konnwei KW850 is its integrated battery testing capability. While not common in basic OBD2 scanners, this function allows you to check your battery voltage and assess its health directly through the OBD2 port.
This eliminates the need for a separate battery tester and the hassle of accessing the battery terminals directly. The KW850 provides a convenient and surprisingly accurate battery voltage reading, which I verified against a multimeter. This is a significant advantage highlighted in this Konnwei OBD2 review.
Furthermore, the Konnwei KW850 goes a step beyond many OBD2 scanners by offering OBD1 compatibility. While OBD1 vehicles are becoming less common, this feature provides peace of mind for owners of older cars or those who work on a variety of vehicles. Knowing the KW850 can handle both OBD1 and OBD2 diagnostics adds to its versatility.
Konnwei KW850 Limitations
No Konnwei OBD2 review would be complete without addressing the limitations. Despite its strengths, the KW850 isn’t without its drawbacks:
1. Size: A Double-Edged Sword
The most immediately noticeable limitation is its size. While the large size contributes to its robust feel and easy-to-read screen, it also makes it less portable and potentially cumbersome to use in tight spaces within the vehicle. For a basic code reader, the size feels somewhat disproportionate. It lacks the ability to scan systems beyond basic OBD2 functions like transmission, ABS, or airbags.
2. Detachable Cable: Pros and Cons
The detachable OBD2 cable is a mixed bag. On one hand, it makes storage easier and potentially prolongs the lifespan of the cable if it gets damaged. On the other hand, it introduces the risk of losing the cable, rendering the scanner useless. Careless users or those with children might find the detachable cable more of a liability than a benefit.
Konnwei KW850 Alternatives
If the Konnwei KW850 isn’t quite the right fit, several alternatives are worth considering:
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Ancel AD410: A compact and reliable OBD2 scanner that I’ve personally used for years. It’s a smaller, more portable option that covers the essential OBD2 functions. Read my Ancel AD410 review for more details.
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Ancel AD410 Pro: An upgraded version of the AD410 that adds battery testing functionality, mirroring one of the KW850’s key features, but in a smaller form factor.
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Foxwell NT301: If you appreciate a larger scanner but want something slightly less bulky than the KW850, the Foxwell NT301 is a good option. It offers similar OBD2 functionality in a still-substantial, but perhaps more manageable size. Check out my Foxwell NT301 review for a deeper dive.
Final Verdict: Should You Buy the Konnwei KW850?
This Konnwei OBD2 review concludes with a recommendation. The Konnwei KW850 is a unique OBD2 scanner. Its large size and robust build quality certainly make a statement. If you appreciate tools that feel substantial and are easy to handle, the KW850 might appeal to you. The inclusion of battery testing and OBD1 compatibility adds practical value, especially for those who work on older vehicles or want an all-in-one tool.
However, if portability and compactness are priorities, or if you find the size excessive for basic OBD2 tasks, alternatives like the Ancel AD410 or AD410 Pro might be more suitable. Ultimately, the best OBD2 scanner depends on your individual needs and preferences. If you value a large, feature-rich basic scanner with battery testing and OBD1 support, the Konnwei KW850 is a solid contender.
Stay Tuned for More Auto DIY Reviews!
Throttle Lan
DIY Mechanic and Auto Writer
With half a decade of hands-on car repair experience, I’m passionate about all things automotive. From engine rebuilds to routine maintenance, I believe in empowering others to tackle car repairs themselves. When I’m not under the hood, I’m sharing my knowledge and experiences through writing.
