My brother’s arrival with what appeared to be a substantial code reader immediately sparked my interest. It was the Konnwei KW850 OBD2 Scanner Code Reader, and as a DIY enthusiast, I was instantly drawn to it, eager to see how it tackled a check engine light issue. Having never encountered this particular scanner before, my curiosity was intensely piqued by its size. He mentioned it was a basic code reader, which made its large form factor even more intriguing. I knew then I had to get my hands on the Konnwei KW850 and put it through its paces for a thorough review. After spending a week with this OBD2 scanner, I’m ready to share my detailed thoughts and experiences.
First Impressions: Size and Build
When my brother first presented the Konnwei KW850 OBD2 Scanner Code Reader, my initial thought was that he was holding some kind of high-tech gadget – it was that imposing! To this day, its size remains remarkable, especially considering it’s classified as a basic code reader. Initially, I had assumed it was a comprehensive, advanced diagnostic tool capable of intricate vehicle module scans and complex operations. The sheer size suggested serious capability. Even after my brother clarified its basic nature, my mind raced with possibilities. The real test, I figured, would come when I connected the Konnwei KW850 to my own car’s OBD2 port. Holding it for the first time, its weight was immediately noticeable – a reassuring heft that felt substantial and well-built, reminiscent of the robust feel of other quality tools I’ve used. Upon inspecting the packaging contents, I found the Konnwei KW850 came with:
- Eco-friendly biodegradable packaging.
- An informative user manual.
- A practical carrying pouch for storage.
- And, of course, the Konnwei KW850 OBD2 scanner itself.
Functions and Abilities: What Can the KW850 Do?
Given its size, I had set high expectations for the Konnwei KW850 OBD2 Scanner Code Reader. However, plugging it into my vehicle’s OBD II port brought a dose of reality, revealing its true capabilities. While it may not be the advanced scan tool my initial impressions suggested, the Konnwei KW850 effectively performs its core functions. Here’s a breakdown of what this OBD2 scanner is capable of:
Basic OBD2 Code Reading and Clearing
When your car’s engine control unit (ECU) detects an issue outside of normal operating parameters, it generates a Diagnostic Trouble Code (DTC). This often triggers the dreaded check engine light on your dashboard. The Konnwei KW850 OBD2 scanner excels at reading these codes, providing you with a quick diagnosis of the problem. These DTCs are essentially codes that tell a story about what’s going wrong. Understanding these codes is crucial for effective car repair, and the KW850 helps you access this information directly. Once you’ve addressed the underlying issue, this scanner also allows you to clear the DTCs and turn off the check engine light, giving you a clean slate to monitor for any new problems.
DTC Lookup Feature
The trouble codes retrieved by the Konnwei KW850 OBD2 Scanner Code Reader can seem like gibberish to someone unfamiliar with automotive diagnostics. Unless you’re a seasoned mechanic or an advanced DIYer, deciphering these codes can be confusing. This is where the KW850’s built-in DTC lookup feature becomes invaluable. By simply entering the code displayed on the scanner, you get an immediate, easy-to-understand explanation of what the code means. This feature bridges the gap between technical codes and practical understanding, making the diagnostic process accessible to a wider range of users. It transforms potentially cryptic codes into actionable information.
Live Data Stream Monitoring
Diagnosing car problems often requires more than just reading codes. Sometimes, to pinpoint the root cause, you need to delve into live data from your vehicle’s sensors. For example, a P0171 code indicating a “system too lean (bank 1)” is just a starting point. To truly understand why the system is lean, you need to examine live data. The Konnwei KW850 OBD2 Scanner Code Reader provides this capability, allowing you to monitor real-time parameters like air flow (in g/s). By comparing these live data readings to expected values for your engine, you can identify anomalies. In the lean condition example, monitoring live air flow data can help differentiate between a sensor issue and a vacuum leak causing unmetered air to enter the system. This live data stream functionality, though often considered basic, is a critical feature for effective diagnostics, and the KW850 includes it.
Beyond Basic: Additional Features
Beyond the core functions of code reading, DTC lookup, and live data streaming, the Konnwei KW850 OBD2 Scanner Code Reader includes several useful additional features. These enhance its utility and make it a more versatile tool for car maintenance:
- I/M Readiness: This function checks your vehicle’s emissions systems to ensure they are functioning correctly and within regulatory limits. It’s particularly useful before emissions testing.
- EVAP System Monitor: Tests the Evaporative Emission Control System for leaks, helping to maintain both vehicle performance and environmental compliance.
- O2 Sensor Test: Checks the functionality of your vehicle’s oxygen sensors, which are crucial for fuel efficiency and emissions control.
- Vehicle Information Retrieval: Allows you to access important vehicle information like VIN, CID, and CVN directly from the scanner.
- Review/Delete Functions: Provides the ability to review and delete previously recorded DTCs, freeze frame data, and data streams.
- Print Data: A convenient feature that allows you to print out diagnostic reports if you need a hard copy of the scan results.
Vehicle Compatibility: OBD2 and OBD1 Support
Vehicle compatibility is a key consideration when choosing an OBD2 scanner code reader. The Konnwei KW850 OBD2 Scanner Code Reader is designed to be compatible with most modern cars on the road today. During my testing, I used it on a variety of vehicle brands, makes, and models (excluding hybrids, sports cars, and electric vehicles) and found it to work seamlessly in all cases. It’s important to note that all the test vehicles were OBD II certified. If you have an older vehicle that is OBD I certified, it’s recommended to confirm compatibility with Konnwei directly. However, for the vast majority of drivers with OBD II compliant vehicles (post-1996 models in the US), the KW850 is likely to be compatible. A standout feature of the Konnwei KW850 is its support for both OBD II and older OBD I vehicles. While OBD I vehicles are less common now, this backward compatibility is a significant advantage, especially for enthusiasts who work on classic cars or own older models.
Battery Testing Feature: A Convenient Addition
In a market where many basic OBD2 scanners lack advanced features, the Konnwei KW850 OBD2 Scanner Code Reader stands out with its integrated battery testing capability. While some scanners like the Ancel AD410 Pro offer battery testing, it’s not a standard feature in this category. The KW850 conveniently tests battery voltage and assesses battery health directly through the OBD II port. This eliminates the need to access the battery directly under the hood or in the trunk, streamlining the diagnostic process. I verified the accuracy of the battery test with a multimeter and found the readings to be consistent and reliable. This built-in battery tester is a valuable addition, particularly useful for diagnosing no-start conditions or assessing overall battery health without needing a separate battery tester.
Limitations: Where the KW850 Falls Short
This Konnwei KW850 OBD2 Scanner Code Reader review wouldn’t be complete without addressing its limitations. Despite its strengths, there are areas where the KW850 has drawbacks:
Size – A Double-Edged Sword
The most prominent limitation of the Konnwei KW850 is its sheer size. While it initially impressed with its robust appearance, for a basic code reader, it is undeniably bulky. This large size doesn’t translate into advanced functionality. Despite its dimensions, the KW850 remains a basic OBD2 scanner, lacking the ability to scan systems like the transmission, ABS, or airbags. For users needing comprehensive diagnostics beyond engine codes, the KW850 falls short. Its size is more of a physical characteristic than an indicator of advanced diagnostic capabilities.
Detachable Cable – Blessing or Curse?
The detachable cable of the Konnwei KW850 OBD2 Scanner Code Reader can be viewed as both an advantage and a disadvantage. On the one hand, detaching the cable makes the unit easier to store, reducing clutter and potential cable damage during storage. However, this detachable design also presents a risk. The cable can be easily misplaced or lost, especially for those who are less organized or have children who might tamper with car tools. Losing the cable renders the scanner unusable, making it a critical component to keep track of. Whether the detachable cable is a blessing or a curse depends largely on the user’s organizational habits and environment.
Konnwei KW850 Alternatives: Exploring Other Options
If you’re considering the Konnwei KW850 OBD2 Scanner Code Reader, it’s worth exploring some alternatives, depending on your specific needs and priorities:
- Ancel AD410: For those seeking a more compact and equally reliable basic code reader, the Ancel AD410 is an excellent alternative. It’s a smaller, more portable unit that still provides robust basic OBD2 functionality. I’ve personally used the AD410 for years and keep it in my glove box for its convenience and reliability. Read my Ancel AD 410 review for a detailed look.
- Ancel AD410 Pro: If battery testing is a desired feature but you prefer a smaller form factor, the Ancel AD410 Pro is a strong contender. It builds upon the AD410 by adding battery testing capabilities in a similarly compact design. This makes it a balanced option for those who value both portability and battery diagnostics.
- Foxwell NT301: If you are drawn to the larger size of the Konnwei KW850 but are open to alternatives, the Foxwell NT301 is another sizeable OBD2 scanner to consider. While not quite as large as the KW850, it offers a substantial feel and similar basic OBD2 functions, though it lacks the battery testing feature. Check out my Foxwell NT301 review for more information.
Conclusion: Who Should Buy the Konnwei KW850 OBD2 Scanner Code Reader?
The Konnwei KW850 OBD2 Scanner Code Reader is best suited for individuals who appreciate a tool with a commanding presence and a comprehensive set of basic features. If you value a larger, more substantial tool that makes a statement, the KW850 fits the bill. Its unique combination of OBD I and OBD II compatibility, along with the integrated battery testing function, sets it apart from many basic code readers. For those who want a basic battery checker built into their code reader and appreciate the added versatility of OBD I support, the Konnwei KW850 is a compelling choice. However, if you prioritize portability and only need basic code reading without battery testing, the Ancel AD410 is a more practical option. And if you want battery testing in a smaller, more convenient package, the Ancel AD410 Pro offers a great balance of features and size. Ultimately, the Konnwei KW850 OBD2 Scanner Code Reader is a solid basic scanner with a unique feature set and a distinctive, large form factor that will appeal to certain users.
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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.
