Home > DIY > CLA Class > C117 (2014-Present) > How to use a OBDII Bluetooth adapter to reset Check Engine Light on your Mercedes-Benz
YouTube video

How to use a OBDII Bluetooth adapter to reset Check Engine Light on your Mercedes-Benz

How to use the OBD-II, Bluetooth, and Your Phone to troubleshoot your Mercedes-Benz

All Mercedes-Benz cars manufactured after 1996 are equipped with an OBD-2 port, mandated by federal regulations. OBD stands for On-Board Diagnosis.

The OBD-II port allows you access to your car’s Engine Control Unit (ECU), which monitors, RPMs, sensors, emissions, mileage speed, and various other parameters. When there is a problem with the car, the ECU triggers a Diagnostic Trouble Code (DTC) or Fault Code by illuminating the Service Engine / Check engine on your instrument cluster. If Check Engine Light greeted you, you could retrieve the codes using your phone (iPhone or Android) and a Bluetooth Adapter as a scanner. You can use a device such as Veepeak Mini WiFi OBD2 OBDII OBD II Scanner Scan Tool Adapter or any OBD-II Bluetooth Adapter on Amazon Best Selling Code Reader list.

If the Check Engine or Service Engine Soon light is on your car, and is staying on or flashing, here is what you need to do.

How to connect the Bluetooth Adapter to the OBD II port and your Smartphone

1. Locate the OBD-II port on your car. It is located under the dashboard on the driver’s side. The port is typically either black or white. Look above the brake pedal, and you can see it. The port has sixteen pins. Some of the pins may be missing depending on the signal protocol used by the manufacturer. This port is required by federal law and will work with any scan tool that is OBD II compatible.OBD2-OBD-II-BENZ

2. Plug the Bluetooth adapter into the OBD II port. Make sure that the lights turn on in your Bluetooth adapter.

3. Pair your phone with the adapter. Go to the settings of your phone, and turn on Bluetooth. Then search for Bluetooth devices. You will see an OBD II device discovered. Click on it, and you should be asked for a pairing code. Try 1234 or 0000. If these two codes don’t work, read the manual for the Bluetooth adapter to find out what code the manufacturer used.

4. Go to the Play Market or App Store and download a free OBD II app that will allow you to pair it with your OBDII Bluetooth diagnostic scanner. We would recommend you try Torque App.

5. Download and open your App to ensure it is connected to the Bluetooth adapter. You can stream live engine data such as RPMs, temperature, engine load, etc. More importantly, you can hit Read Fault Codes and retrieve the trouble codes for your Mercedes-Benz.

6. Once you see the error code list, click the Menu button and hit Clear / Erase Fault Codes. Please note that you should only delete the fault codes if the problem has been repaired. If you erase the fault codes without fixing the problem, the check engine light will revert. Depending on what triggered the check engine light initially, it may turn on immediately, or it could take a few days.

Benefits of using Bluetooth to check the engine lightbluetoth app obdii obd2 mercedes benz

The Bluetooth adapters are great as not only can they read and erase the service engine light, but they also can be used to stream real-time information. A Bluetooth adapter paired with a good app can provide valuable information such as:

  • Stream Realtime Information
  • Check / Read Fault Codes DTC
  • See Test Results
  • Provide Graphing
  • Display a tachometer or accelerometer
  • Record your 0-60 or 0-100 mph times.
  • Stream RPM
  • Fuel Flow Rates
  • The temperature of the coolant, oil, or intake air

Depending on the adapter you use, you may also be able to store profiles and get fuel economy readings and horsepower.


Using an OBD2 Bluetooth Adapter as a scan tool is a great way to troubleshoot your Mercedes-Benz via the OBD-II port. You will be able to read and erase the fault codes (diagnostic trouble codes), and you can use your phone to see if you are driving efficiently and check if you are ready for the emissions test.

But if you want a more professional scanner tool, use the YOUCANIC Full System Scanner.

YOUCANIC full system diagnostic scanner is a powerful tool that can help you troubleshoot Mercedes-Benz problems quickly and efficiently. This scanner can communicate with all the control units in your Mercedes-Benz, including the engine, transmission, ABS, SRS, and more. By accessing real-time data from these control units, you can pinpoint the root cause of the problem and take appropriate action to resolve it.

Whether you’re experiencing issues with your engine, transmission, or other systems in your Mercedes-Benz, the YOUCANIC diagnostic scanner can provide valuable insight into what’s going on under the hood. This scanner can help you identify error codes, read live data, and perform special functions like reset adaptations or component tests. With this information, you can make informed decisions about repairs, maintenance, and upgrades to keep your Mercedes-Benz running smoothly.

Overall, the YOUCANIC full system diagnostic scanner is invaluable for any Mercedes-Benz owner or technician looking to troubleshoot problems quickly and accurately. With its user-friendly interface and powerful diagnostic capabilities, you can save time, money, and frustration by diagnosing and resolving issues with your Mercedes-Benz quickly and efficiently.

Note that these Bluetooth OBDII scanners only read and erase the check engine light. If you need to read and clear codes from other control units such as ABS, SRS, ETS, TCU, and more, you will need a professional scanner such as Launch Creader Viii Complete System Scanner.


  1. very informative and great suggestions . I’m trying to access my maintenance schedule menu under the service section on the dash display section .

  2. Https://Www.Soccerrebounders.Us

    Thanks for some other informative web site. Where else may I am getting
    that type of info written in such a perfect manner? I have a project that
    I am just now operating on, and I have been on the look out for such information.

Leave a Reply

Your email address will not be published.

All rights reserved Notice: CLOUD