My brother rolled into the driveway the other day, check engine light glaring on his dashboard, and brandishing what looked like a serious piece of diagnostic equipment. It was the Konnwei KW850 OBD2 scanner, and my inner gearhead immediately perked up. I had to get my hands on this thing and see what it was all about.
Having spent years tinkering with cars and reviewing various diagnostic tools, I was intrigued by the sheer size of the KW850. For a tool billed as a basic code reader, it was surprisingly substantial. This Konnwei KW850 review is based on a week of hands-on experience, digging into its features and capabilities to help you decide if it’s the right scanner for your needs.
Let’s dive into what makes the Konnwei KW850 tick.
First Impressions: Konnwei KW850 Unboxing and Design
When my brother first presented the Konnwei KW850, my initial thought was, “Wow, that’s a big code reader.” It’s not your typical compact, pocket-sized scanner. The size is the first thing you notice – it has a robust, almost industrial feel to it. It definitely makes a statement.
Despite its size, the KW850 feels well-built and durable. Holding it in your hand, there’s a reassuring heft, similar to the Foxwell ST203 I compared to the ST201. It comes packaged in a biodegradable cardboard box, which is a nice touch, and includes a user manual, a protective carrying pouch, and the scanner unit itself. The bold design gives the impression of a high-end diagnostic tool, even though it’s positioned as a basic OBD2 scanner. I was eager to see if its performance matched its imposing appearance.
Konnwei KW850 Functions and Capabilities: Beyond Basic Code Reading
Despite its initial appearance suggesting advanced diagnostic capabilities, the Konnwei KW850 is fundamentally a basic OBD2 code reader. However, it executes these core functions effectively and includes a few surprising extras. Plugging it into my vehicle’s OBD II port, I explored its range of features:
1. Effortless OBD2 Code Reading and Clearing
The primary function of any OBD2 scanner is to read and clear Diagnostic Trouble Codes (DTCs) that trigger the check engine light. The Konnwei KW850 performs this task admirably. When your car’s computer detects an issue, it sets a DTC, illuminating the dreaded check engine light. The KW850 quickly retrieves these codes, giving you a clear indication of the problem.
These DTC codes might seem cryptic to the uninitiated, but the KW850 simplifies interpretation with its built-in DTC lookup feature. Once you’ve addressed the underlying issue, the scanner allows you to easily clear the codes and turn off the check engine light, providing peace of mind and a clean dashboard.
2. Integrated DTC Lookup for Quick Diagnostics
For those unfamiliar with OBD2 codes, the KW850’s DTC lookup function is a lifesaver. Instead of having to search online databases, you can simply input the code directly into the scanner, and it provides a straightforward explanation of the fault. This feature is incredibly helpful for DIYers and car owners who want to understand the problem before seeking professional help. It bridges the gap between technical jargon and practical understanding, making car diagnostics more accessible.
3. Live Data Stream Monitoring for In-Depth Analysis
Going beyond simple code reading, the Konnwei KW850 offers live data stream functionality. This feature allows you to monitor real-time data from your vehicle’s sensors, which is crucial for diagnosing intermittent issues or understanding the context behind a DTC.
For example, a “system too lean” code (P0171) can be further investigated by examining live data. By monitoring parameters like air flow (grams per second), you can compare readings against expected values for your engine size and cylinder configuration. Deviations can point to issues like vacuum leaks, which wouldn’t be apparent from the code alone. This live data capability adds a layer of diagnostic depth often found in more advanced scanners.
4. Additional Useful Features: I/M Readiness, EVAP Test, and More
Beyond the core functions, the KW850 includes several other useful features:
- I/M Readiness: Checks the status of your vehicle’s emissions systems, ensuring they are ready for smog testing.
- EVAP System Test: Diagnoses issues within the Evaporative Emission Control System, helping to identify fuel vapor leaks.
- O2 Sensor Test: Monitors the performance of your oxygen sensors, critical for fuel efficiency and emissions control.
- Vehicle Information Retrieval: Displays essential vehicle information like VIN, CID, and CVN.
- Data Review and Print: Allows you to review saved data, freeze frame information, and even print diagnostic reports if connected to a computer.
Konnwei KW850 Vehicle Compatibility: OBD2 and Beyond
Vehicle compatibility is paramount for any OBD2 scanner. The Konnwei KW850 boasts broad compatibility with most modern cars and light trucks manufactured from 1996 onwards, as they are typically OBD2 certified. During my testing, it worked seamlessly across various brands and models (excluding hybrids, electric vehicles, and high-performance sports cars).
It’s important to verify your vehicle’s OBD certification, especially for older models. While the KW850 is primarily designed for OBD2 vehicles, it also surprisingly offers OBD1 compatibility. This is a significant advantage, as many basic scanners focus solely on OBD2. If you work on older vehicles or have a classic car, this OBD1 capability can be a valuable asset. For specific compatibility concerns, it’s always recommended to consult the manufacturer directly.
The Unexpected Bonus: Konnwei KW850 Battery Testing Feature
A standout feature of the Konnwei KW850, and one not commonly found in basic OBD2 scanners, is its integrated battery testing function. Typically, battery testing requires a separate tool and direct connection to the battery terminals under the hood or in the trunk. The KW850 simplifies this by allowing you to test battery voltage and health directly through the OBD2 port.
This is incredibly convenient, eliminating the need to access the battery physically. In my tests, the battery readings were accurate when cross-referenced with a multimeter. This built-in battery tester adds significant value, especially for diagnosing no-start conditions or assessing overall battery health without extra equipment.
Konnwei KW850 Limitations: Size and Cord Considerations
Despite its strengths, the Konnwei KW850 isn’t without limitations:
1. Size Matters: The Bulk Factor
The most prominent drawback is its sheer size. While the robust build quality is appreciated, the bulky dimensions make it less portable and potentially cumbersome to use in tight spaces under the dashboard. For a basic code reader, its size is disproportionate to its feature set. It lacks advanced functions like ABS, SRS, or transmission diagnostics, which are often expected in larger scanners.
2. Detachable Cord: A Double-Edged Sword
The detachable OBD2 cable is a mixed bag. On one hand, it aids in storage and prevents cable damage when not in use. On the other hand, it introduces the risk of misplacing the cable, rendering the scanner useless. For users who are meticulous about organization, the detachable cord is a benefit. However, for those prone to losing accessories, it could be a point of frustration.
Konnwei KW850 Alternatives: Exploring Other Options
If the Konnwei KW850 doesn’t quite fit your needs, several compelling alternatives are worth considering:
-
Ancel AD410: A compact and highly reliable OBD2 scanner, the Ancel AD410 is a long-time favorite for its portability and essential functions. It lacks the battery testing feature but is significantly smaller and more glovebox-friendly.
-
Ancel AD410 Pro: Stepping up from the AD410, the Pro version adds battery testing capabilities in a similarly compact form factor. If battery testing is desired in a smaller package, the AD410 Pro is an excellent choice.
-
Foxwell NT301: For those who appreciate a larger scanner but want a different brand, the Foxwell NT301 offers a similar size and feature set to the KW850, albeit without the battery testing function.
Conclusion: Who Should Buy the Konnwei KW850 OBD2 Scanner?
The Konnwei KW850 OBD2 scanner is a unique tool that blends basic OBD2 functionality with a robust design and a surprising battery testing feature. Its large size makes a statement, and its OBD1 and OBD2 compatibility broadens its appeal.
Who is it for?
- Users who value a substantial, durable tool: If you prefer tools that feel solid and built to last, the KW850’s size and construction will appeal to you.
- DIYers needing battery testing: The integrated battery tester is a genuine convenience, especially for diagnosing starting issues or monitoring battery health.
- Owners of both OBD1 and OBD2 vehicles: The dual compatibility is a significant advantage for those working on a range of vehicles, including older models.
Who might consider alternatives?
- Users prioritizing portability: If a compact, glovebox-friendly scanner is essential, the Ancel AD410 or AD410 Pro are better choices.
- Users needing advanced diagnostics: For functionalities beyond basic code reading and live data, more advanced scan tools are necessary.
In summary, the Konnwei KW850 is a capable and somewhat unusual OBD2 scanner. If you appreciate its robust design, value the integrated battery tester, and can accommodate its size, it’s a worthwhile tool. However, if portability is key or advanced diagnostics are required, consider the alternatives mentioned. For a reliable basic OBD2 scanner with added battery testing and OBD1 compatibility, the Konnwei KW850 is a solid contender.
Love the Above? Subscribe for More
Throttle Lan
DIY Mechanic and Freelance Auto Writer
I’ve been fixing cars for about half a decade now. If it has an engine, I’ll make it run, without question (even if it’s engineered in hell). When I’m not fixing cars, I write about the process.
