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Konnwei KW850

Konnwei KW850 Review 2025-CEL Scan Tool for OBD2 Cars

Last Updated on April 11, 2025

Is your car emitting an unpleasant, pungent smell or showing unusually high intake air temperature readings? These are signs that something could be wrong under the hood—and the Konnwei KW850 automotive diagnostic scanner can help you detect and resolve such issues quickly. This versatile OBD2 scan tool saves both time and money by allowing you to diagnose problems without the need for frequent trips to the mechanic. In this Konnwei KW850 Review, we’ll explore why this feature-rich and budget-friendly OBD2 scanner is a smart choice for everyday car owners and DIY mechanics.

The Konnwei KW850 scan tool is a powerful and affordable option for DIYers, beginner mechanics, and everyday car owners. While the scanner is not designed for professional-level diagnostics, it offers many advanced features that go beyond just reading and clearing trouble codes. It supports all OBD2 protocols, retrieves essential vehicle information, and even tests your battery health.

With a clear, 2.8-inch color LCD screen, intuitive hotkeys, and a compact, ergonomic design, the KW850 is extremely easy to use. Whether you want to monitor live data, check I/M readiness, or view freeze frame information, this scanner delivers dependable performance.

Auto Code Reader: Konnwei KW850 Features & Benefits (2025 Update)

  • ✔ Clears codes, turns off the Check Engine Light (MIL), and resets monitors
  • ✔ Supports all OBDII protocols (CAN, J1850 PWM, J1850 VPW, ISO9141, KWP2000)
  • ✔ Multilingual menu options and built-in code definitions (English, Spanish, French, German, etc.)
  • ✔ Retrieves VIN, CIN, and CVN for supported vehicles
  • ✔ Displays full live data stream in both numerical and graphical formats
  • ✔ One-click I/M readiness hotkey for emissions testing
  • ✔ Reads and displays freeze frame data
  • ✔ Reads and defines engine fault codes (generic and manufacturer-specific)
  • ✔ Extensive vehicle coverage: Works on most 1996 and newer US, EU, and Asian vehicles
  • ✔ Lifetime free online software updates and print capability via PC
  • ✔ 2.8-inch TFT color screen, larger and clearer than models like Autel AutoLink AL319
  • ✔ Built-in memory backup for off-vehicle data review and analysis
  • ✔ Includes a code lookup library with over 8,000 built-in DTC definitions
  • ✔ 36-month worry-free warranty for peace of mind

Technical Specifications

Features

Konnwei KW850 Auto Code Reader
Works: ALL 1996 and newer vehicles
Display: 2.8″ LCD color display (320 X 240 dpi)
Check Engine Light(MIL): Yes, determines the cause
Views freeze frame data: Yes
O2 sensor test: Yes
Live PCM data stream: Yes
Evaporative control system test: Yes
Display fault code definition automatically: Yes
Emissions readiness checks: Yes
Emissions-related System: Yes
Check mpg/miles per gallon: No
One-click readiness: Yes
Battery check: Yes
Update Option: Free Update Online Lifetime
Warranty: 3-year Warranty
Price: Konnwei KW850 ReviewCheck Today’s Price

Whether you’re troubleshooting a check engine light or performing regular maintenance, the Konnwei KW850 offers exceptional value with reliable performance and broad compatibility. It’s a great investment for those who want a dependable automotive code reader with all essential functions at a budget-friendly price.

Related article: OBDLink LX VS MX: Which Bluetooth scanner should you buy in 2025?

OBD2 Scanner Konnwei KW850 Review 2025

The KW850 scanner has extensive vehicle coverage as it functions on most 1996 US-based, 2003 EU-based, Asian OBD2, and CAN domestic and foreign vehicles. On top of that, the device comes with lifetime free online updates and a worry-free 36-month warranty. It is also compactly designed and lightweight for easy use and storage. With its sturdy casing, the device will defy daily wear and tear at work to offer many years of use.

Read our Konnwei KW850 review to the end to find out more about the KW850 features, benefits, and setbacks. This is a must-have tool for small car shop owners and individual car owners.

Easy to use

One of the joys of using the Konnwei KW850 scanner is that it is very easy to use. It comes with an intuitive user interface, and it is a plug-and-play device. The hotkeys are clearly labeled and very easy to press. The 2.8-inch LCD color screen displays all the outcomes making reading the device to be easy. Furthermore, the LCD color screen displays a graphical real-time sensor analysis. The extra-long 4.5-inch diagnostic cable allows the user to access the code reader even when outside the vehicle. But it is not MAC or IOS supported. So if you have an IOS system, you have to choose the Carista OBD2 Bluetooth scanner.

With the multilingual menu, this scan tool can be used by people from different parts of the world as one can select a language of choice. It has English as the default language, as Spanish, French, etc.
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KONNWEI KW850 compatible cars

If you handle more than one car brand, this is a suitable diagnostic code reader. It works on most vehicles sold in the USA from the year 1996 and newer. Also, it functions on most 1996 US-based, 2003 EU-based, Asian OBD2, and CAN domestic and foreign vehicles. This includes light trucks, SUVs, cars, etc. Some car brands it is compatible with include Chevrolet, Ford, Lamborghini, Audi, Kia, Mazda, BMW, GM, Ferrari, Jeep, Subaru, Fiat, Rolls Royce, Peugeot, Jaguar, etc.

Wide range of functions

Regardless of being sold at a very affordable price, the Konwei KW850 scanner performs a wide range of functions. To start with, it can read and erase error codes, test battery, freeze frame data, evaporative control system test, one-click readiness, live PCM data stream, display fault code definition automatically, O2 sensor test, etc. The best part of all is that it comes with a look-up library with more than 8,000 built-in generic code definitions that enable you to accurately detect the cause of the check engine light and fix it without having to visit a mechanic. So comparing the price, the tool is more advanced than the Foxwell NT201 auto code reader or the Actron CP9125 pocket scanner.

Compact and sturdy code reader

The Konnwei KW850 code reader is sturdily made of strong plastic material and cover. These prevent it from being damaged when it accidentally falls on the ground. With measurements of 9.4 x 3.9 x 2 inches, this is a really compact gadget. It also weighs around 1 pound, making it lightweight. Therefore, storing or using this gadget is easy and convenient. For proper storage, the manufacturer provides a storage case that keeps it safe. But if you want a Bluetooth-enabled device, you can use the Innova 3120 wireless OBD2 scanner.

Lifetime free software update

If you intend to use this scan tool for a long while, then there is nothing to worry about. You can always update the device in order for it to work on the latest vehicle makes and models. It comes with a lifetime of free software updates, which helps you fix the latest bugs or newly added vehicle features. The only challenge is that it cannot be updated on a MAC PC.
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Warranty and support

The manufacturer offers a worry-free 3-year warranty to buyers of the product. This assures you of your investment, as you can return the device or have it repaired if it is damaged within this period. In addition, Konnwei has an excellent customer support team that answers all your queries and provides you with solutions to different issues.

Setbacks of the Konnwei KW850 scan tool

It is not compatible with all vehicles, but you can use this scanning device for AUDI cars. Before you purchase this scan tool, you should discover if it is compatible with your vehicle or not. If you have a hybrid or electric vehicle, this scanner will not work on your car. Also, many users have complained that it has compatibility issues with Japanese vehicles. So, check for compatibility before buying it.

The device is not compatible with iOS devices. This is another challenge, as you will not be able to update the device using MAC PC. This means that you will have to acquire windows in order to update the KW850 scanner.

Troubleshooting for the Konnwei kw850 Scan tool

Problems Possible Cause Solution
The scanner not powering on Faulty power connection or dead battery Check the power connection or replace the battery
No communication with the vehicle’s ECU Unsupported vehicle model or protocol mismatch Verify vehicle compatibility or check the OBD-II protocol
Error codes not clearing Vehicle issue not resolved or incorrect procedure followed Ensure the vehicle issue is fixed or follow the correct clearing procedure
Inaccurate or inconsistent readings Firmware issues or outdated software Update the firmware or reinstall the software
Screen display issues Screen damage or firmware glitch Check for screen damage; if none, update the firmware
Frequent disconnections during scanning Weak connection or loose OBD-II port Secure the connection or check the OBD-II port for damages

Comparison Table: Konnwei kw850 vs kw860 scan tool

Features Konnwei kw850 Konnwei kw860
Display: 2.8” Wide TFT color screen 2.8-inch screen
Operating Temperature:  0 to 60 ?? (32 to 140 ?H) 0 – 60?? (32 – 140 ?H)
Storage Temperature:  -20 to 70 ?? (-4 to 158 ?H) -20 – 70?? (-4 – 158 ?H)
Power:  8 to 18 V provided via vehicle 0.77W
Dimensions:  7.68 x 3.94 x 1.38 inches 7.87 x 3.93 x 1.57 inches
Weight:  0.8kg  0.733 Kg
Supported Protocols:  J1859-41.6, J1850-10.4, ISO9141, KWP2000 (ISO 14230), and CAN (Control Area Network ISO 11898) ISO 9141, KWP2000, SAE J1850, CAN,J1850 VPW,J1850 PWM

Conclusion

Finding a quality diagnostic scanner at an affordable price is not easy. But the Konnwei KW850 scan tool offers outstanding features at a great price. The plug-and-play device is very fast and reliable. It can retrieve both manufacturer-specific and generic codes. Other functions include reading oxygen sensors, detecting why your vehicle is having issues with its air intake, displaying a live data stream, and much more.

Related article: Check the latest review of ANCEL AD410 affordable scan tool

This is an accurate and sturdy scan tool that is ideal for startup mechanics, professional technicians, and small car repair shop owners. The device has a wonderful warranty of 3 years and lifetime free updates. With such features, this is a scanner that you can rely on to diagnose different vehicles and perform a wide range of functions. I hope this Konnwei KW850 review was helpful to you.

FAQs

Question: Does Konnwei offer a warranty on its products?  
Answer: Yes, it does. Konnwei is a reliable brand that has continued to broaden its products. For instance, the manufacturer offers a 36-month worry-free warranty to buyers of the Konnwei KW850 scanner. This removes any doubt and increases trust in the product. In case it comes with a defect or issue, you can always contact the manufacturer to have it repaired or replaced.

Question: Does the Konnwei KW850 work on the 2012 VPG mv-1 car?
Answer: Yes, it does. This code reader fully supports the 2012 VPG mv-1 passenger cars. Besides, it also comes with amazing features that both DIYers and professional mechanics will love. It is capable of reading and erasing Obd2 codes, inspecting a bad sensor, reading the oxygen sensor, and checking all emission-related trouble codes. It does this to all vehicles manufactured from 1996 and newer. This includes domestic, European, and Asian vehicles.

141 thoughts on “Konnwei KW850 Review 2025-CEL Scan Tool for OBD2 Cars”

  1. Faiyaz

    hi,

    I have konnwei KW 830 model and want to update from version 1.2 of 2017 as I was advised that 2018 version works fine. this one continuously shows communication failure with different models of toyota have checked with RAV4, Allion, Spacio, camry etc but didnt work.

    Please advise where to get an upgrade as uplink doesn’t change anything.

    Reply
          1. Petros Petrou

            Hi Henry,
            Will the Konnwei 850 work on Land rover freelander 1 L Series 314 2.0 DI engine?

            Kind Regards,

  2. Nicholas

    Please I purchased a new konnwei kw850, I have been trying to scan my car Peugeot 406 but it is always saying that there is error in communication (error communicating with the vehicle ECU ) What should I do to rectify this problem.

    Reply
    1. Henry L. Wilburn

      I guess it doesn’t support your car. Also remember, It does not support the OBDI car. If you purchase KW850 scanner from Amazon, then contact with the seller.

      Reply
    2. Mario

      I have problem with permanent code reading on my 2003 Peugeot 206. Seems like Konnwei doesn’t support our Peugeots.

      Reply
  3. Mario

    Konnwei KW850 that I recently bought doesn’t support permanent code reading on my 2003 Peugeot 206. Everything else but that works just fine. I did a check before I got my scan tool and I have ABS and MAF sensor problem, yet on KW850, it won’t show those, and those are permanent codes.

    Reply
  4. Tshepo

    I just plugged in my new konnwei 850 to my yaris 2012 model which had a Airbag light and is permanent light but when I run the scan codes it say no fault codes found yet the airbag light is on.Any idea as to why it’s not kicking it up????

    Reply
    1. Sakhile

      You need a scanner tool which does interior modules (airbag sensor, seatbelt sensor, etc.) the Konnwei 850 and most other less expensive scanners can only check the engine status, nothing else.

      Reply
  8. John

    Will it work for a VW Caddy 2.0L Tdi 2013, and a Ford Ranger 3.0L TDCi 2008? Both diesel engines. Also a Renault Clio 2, 2005 1.4L Petrol engine.
    And a Hyundai 1.6L Petrol, 2011.

    Reply
    1. Henry L. Wilburn

      1) As I said earlier comment that Volkswagen TDI will only work if the VW has a plug to plug in the meter.
      2) Ford Ranger will work.
      3) It is compatible with Renault.
      4) Yes, it will work great with Hyundai.

      Reply
    2. Charl

      I have a Audi A1. It is out of service plan. I dit a complete service. I cleared the oil service on the onboard but cant clear the service in days. I bought the KW850. Pluged it i to car but cant clear the service in days instructions. Do have advice how to do it.

      Reply
  11. Rikus

    Hi Henry thanks for the reply….

    So I bought the Konnwei KW850 – Try it on my 2004 VW Golf 1.6 SR 8v Automatic and it does not work.
    Get the red connection error screen. Also try to use it on a VW 2007 Transporter 1.9 Diesel and also did not work.

    Reply
      1. W

        I just got one and it doesn’t, shows the battery voltage but that’s it? Can’t read codes or nothing.

        Reply
  16. Chris Mynharddt

    I want to know if this diagnostic machine will work on a 2004 Land Rover 110 TD5 Defender and a 2005 Nissan Almera?

    Reply
  20. Sandile

    i just bought the Konnwei KW850, its not reading both my 2003 MK4 1.6 Jetta and Golf. I get the red connection error screen. both the mentioned cars are OBD 2 compatible.

    Reply
      1. Thando Ndala

        Hi
        I have a VW Polo Vivo 1.4i and have bought the Konnwei KW850 Scan Tool, but the Device makes red [X] on all blocks and gives the following message:

        Error in communication with vehicle ECU. Please check:
        1. If tool’s OBDII connector is connected to the vehicle’s DLC.
        2. If the ignition is ON.
        3. Verify that the vehicle is OBDII compliant.

        I did all checks and stil the communication error persist.
        What should I do next?

        Reply
  32. Martin Thabo

    Konnwei kw850 doesn’t work on Audi A4 2008 model. It gives Communication error.
    (1) Why can’t it work on my Audi A4, 2008?
    (2) What is the konnwei kw850’s latest software version?

    Reply
  34. Arto

    Hi! Just plugged in my new kw850 in my Ford Kuga -10 which I have trouble with.
    The ABS light is on and tr,cr as well, but the reader doesent find any issues at all!?
    What is the problem?

    Reply
  38. Harald Adolfsen

    Hi
    Does a Renault Master Dci 100, 2010 model can I use this error code KONNWEI KW850 on it?

    Best regards
    Harald Adolfsen

    Reply
  41. Harry

    Hi Henry
    I have a konnwei 850 and it has communication error when i use it on 2003 BMW X5 will a software update fix this ?
    Kind regards
    Harry

    Reply
  44. Martin Kruger

    Hi, great review. I have an Audi Q5 and want to change the brakes and need to release the caliper electronically. Will the KW850 do it? Thanks

    Reply
    1. Armand

      Hi i just bought the Konnwei 850 but it gives me communication error on my 2011 polo 1.6 and 2015 Hilux 3.0d4d do you have any advice?

      Reply
      1. STEVE

        wrong answer !!! I tried
        with a loan from a friend of mine but it is not connected (it does not find a communication protocol and the KONNWEI 850 is updated.) with the factory diagnostic mitsubishi or with MUT II work.???? your answer ????? I am waiting for an answer and from konnwei for 5 days now I have sent them a message 3 times

        Reply
  53. Phil

    Hi, I am looking to purchase a Fault Scanner to be able to read Vehicle Faults on 2 motor vehicles in particular:-
    1. 2006 Nissan Navara ST-R D22 ZD30 4×4 and:
    2. 2002/2003 Range Rover L322 HSE 4.4 litres SUV that has the factory fitted OEM Air Suspension System.
    On the 2002/2003 Range Rover L322, there is a Air System System Fault Code showing of:- ‘AIR SYSTEM INACTIVE’.
    On reading through the Description of this KW850 Scanner, I am not seeing any reference to Air Suspension Faulty Code capability AND I have not seen or been able to read any reference to Air System Fault Codes of any other brands of Diagnostic Code Scanners that are advertised on the Internet.
    They all allude to being able to read ALL of the vehicle faults, however, I need to know specifically if these type Code Scanners (including this KW850) will identify and show ‘Air System Fault Codes’
    I know, from (my research) that Higher End, more expensive Code Scanners have the Function in them for Air System Fault Codes
    Can you let me know ASAP if this KW850 scanner is compatible to the 2002/2003 Range Rover and has the ability to identify and read any fault codes other than only Engine Fault Code and in particular, the ‘Air System Fault Code?
    Your response will be greatly appreciated at your earliest convenience,
    Kind regards
    Phil
    Perth Western Australia

    Reply
  58. Clarence

    Doesnt work on Nissan wingroad (Y11) YOM 2004, doesn’t work on Toyota landcruiser, doesn’t work on Toyota folder. Its useless for DIY.

    Reply
  59. Jason

    I purchased a new konnwei kw850, I have been trying to scan my car VW Polo 2011 1.6 CLS but it is always saying that there is error in communication (error communicating with the vehicle ECU ) What should I do to rectify this problem.

    Reply
  63. Dhevan Chetty

    Got the new kw8450 and it wont work on the 2011 polo vivo. do i need to load any software to get it to work on this vehicle.

    Reply
  66. Hannes Kellerman

    Good day , I have just bought my first Konnwei 850 and plug it in to three different vehicles and all I get is a non connecting screen, can anybody assist with this problem , or the scanner just faulty ?
    IO Pajero , Nissan Mistral , Nissan Legrand and a Toyota Passo

    Reply
  71. Benjamin Scheepers

    Will my Konnwei Kw850 work on a Alfa Romeo Giulietta?

    I do keep on getting no communication to the ECU.

    Please help.

    Kond regards

    Reply

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