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KONNWEI KW850 OBD2 Oxygen Scanner Review

In this review, I will write about KONNWEI KW850, one of the best OBD2 Scanners in the market 2019.

Let’s start NOW!

Konnwei OBD1 & 2 KW850 Oxygen Scanner
KONNWEI KW850 OBD2 Scanner Professional Auto Code Reader Car Diagnostic Tool Check Engine Light Scan Tool for OBD II Cars Since 1996 (Genuine Version)
4.34.3 / 5
Konnwei OBD2 KW850 is a small adapter that makes finding the cause of the check engine light warnings or trouble codes become evidently much easier.

Overview of KONNWEI KW850

Today, there’s a plethora of OBD2 sensor systems to pick from. What sets them apart is the functions and tasks they are able to perform. These gadgets are quite effective when it comes to diagnosing issues on modern cars, and the same with Konnwei OBD2 KW850.

Konnwei OBD2 KW850 Scan Tool was developed in an attempt to help car owners diagnose their vehicle’s computer.

You can simply connect it to your car’s diagnostic port, start the engine and scan for trouble codes. It is able to read its diagnostic data from this Konnwei hand-held device.

Finding the cause of the check engine light warnings or trouble codes has evidently become much easier.

This tool works on any car, light truck, hybrid, SUV or hybrid manufactured from 1996 to date. You also don’t have to be worried while working with this diagnostic tool.

KONNWEI KW850 is a great OBD2 Scanner for Smog Check
KONNWEI KW850 OBD2 Scanner supports full OBD2 functions and helps you monitor the battery status.
Credit: Amazon.com

Detailed Review of KONNWEI KW850

Features and Functionalities of KONNWEI KW850

KONNWEI KW850 is a Full OBD2 Scanner
The KW850 Supports Full OBD2 Functions.
Credit: Amazon.com

The futuristic-looking Konnwei OBD2 KW850  scanner is effective in its functionality thanks to the following key features.

The tool checks Oxygen (O2) sensor systems and reads On-Board Diagnostics (both OBD I and II) for American vehicles vehicle’s built since 1996.

This gadget can access your manufacturers’ specific diagnostic codes (OEMs) in addition to generic diagnostic codes. It is better than the aftermarket codes and definitions other scanners provide.

This tool can read and freeze, frame data. Frame data is the data recorded by a car in the event of an accident.

The KW850 solves emission and checks engine light related trouble codes through its fix codes database. You can read the record and print real-time vehicle data with this tool. Monitors the battery voltage, temperature, and the engine’s r.p.m.

You can also read and erase transmission and check engine light trouble codes, with just a push of a button.

A video about Konnwei KW850 Universal OBDII Diagnostic Code Reader:

Compatibility of KW850

The Konnwei OBD2 KW850 works on both petrol and diesel passenger cars, SUVs, and light trucks, built after 1996. The device is compatible with all PC and Android systems except iOS.

Software and Update of KONNWEI KW850

The Konnwei OBD2 KW850 has over 3000 built-in generic codes and a large database of code fixes that are certified by professional auto-mechanics.

The package comes with a CD contains software for installation on your personal computer or laptop. With the software installed and the device connected via USB, you can always check for updates.

The gadget’s software provides I/M key car readiness status and monitoring on a graphical view.

The gadget also has detailed information concerning any vehicle, for example, it’s VIN (Vehicle Identification Number) and CID (Calibration Identification).

KONNWEI KW850 is one of the best OBD2 Scanners.
KONNWEI KW850 has a lifetime FREE Update Software.
Credit: Amazon.com


  • Unique, ergonomic and compact design: Its great design makes it easy to hold in one hand.
  • Excess voltage protection:  You can check the performance and record live data as you drive.
  • Compact, strong and durable: Its interface makes it simple for one to navigate without any complications.
  • Supports Russian, English, Portuguese, Spanish, and several other foreign languages. Works on both petrol and diesel motor-vehicles.


  • The gadget only works on American cars.
  • It does not work on Japanese cars and heavy-duty trucks
  • It is not compatible with iOS devices.

Who is KONNWEI KW850 for?

KONNWEI KW850 is one of the best OBD2 scan tools for car owners.
KONNWEI KW850 is a Professional OBD2 Scanner for both car owners and enthusiasts.
Credit: Amazon.com

The Konnwei OBD2 KW850 offers both basic and professional scanning capabilities. This means it can be used by either car owners, DIYers, and car enthusiasts.

You’ll be able to accurately determine the cause of the engine trouble codes and make the right repairs. Quality diagnostics and fix codes are a guarantee since the gadget is equipped with code fixes that have been thoroughly checked by experienced auto-technicians.

Comparison Chart: KONNWEI KW850 vs wsiiroon SR850 and Kzyee KC301

KONNWEI KW850 Professional OBD2 Scanner for Cars After 1996 (Upgraded Version)
wsiiroon SR850
wsiiroon SR850 OBD2 Scan Tool with O2 Sensor, EVAP, I/M Readiness Test
Kzyee KC301
Kzyee KC301 Universal OBD2 Scanner with Mode 6 and Live Data for Diesel and Gasoline vehicles
Customer Rating
4.34.3 / 5
4.24.2 / 5
3.93.9 / 5
Pricekonnwei kw850 pricewsiiroon SR850 priceKzyee KC301price
ProsCompact, strong and durable; Excess voltage protection; Unique, ergonomic and compact design.Supports all OBD2 protocols;
Can perform oxygen sensor tests on most OBD2 vehicles made in the USA.
Extensive vehicle coverage; Excellent Basic Functions.
ConsPossible compatible issues. Possible Trojan Viruses from the software.Cable is not durable; Possible compatibility issue.Possible issues with registration.
Bottom LineKONNWEI KW850 is a great OBD2 Scanner for DIY.If you want an OBD2 Scanner with simple functions for reseting the check engine light, wsiiroon SR850 is built for you.Kzyee KC301 is another option for car owners who want to do simple tests and reseting the CEL on 12V cars and/or trucks.

The Bottom Line

You don’t have to lift the hood to check for your car’s diagnostics. By plugging in the Konnwei OBD2 KW850 to your OBD2 input port, you’ll receive the manufacturers’ specific and generic codes immediately. Yes, accessing your car’s computer is that easy.

One of its outstanding features is its ability to read oxygen sensors. You’ll be able to notice when your car is having problems with its air intake pipes. If you also want to obtain precise car diagnostic scans for either individual or professional use, then this is the go-to OBD2 scanner.

You won’t have to sacrifice durability or quality performance since this gadget will do the car’s diagnostics and oxygen scans with pin-point accuracy and clear all problematic codes.

Bonus: Should Konnwei KW850 not suit you, check out my Review of the Best OBD2 Scanners 2018

Tim MillerFounderOBD Advisor

I knew incidentally what an OBD scanner was by searching on the Internet. Now I have over 10 years of experience in car repair and using OBD scanners. With what I know, I think I should share with everyone. That’s the reason I created this blog.

Web: https://www.obdadvisor.comEmail: [email protected]
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