Is your Mercedes-Benz Check Engine Light on? Learn how to fix the cause of the check engine light to illuminate by reading and clearing faulty codes using an OBD-II Scanner.
To be able to read Mercedes-Benz fault codes, you will need a good diagnostic scanner that can read and clear fault codes from all the control units. The YOUCANIC full system scanner can read and clear codes on all 2000 and newer Mercedes-Benz cars and carry out bidirectional testing of components.
- Park the Mercedes-Benz in a safe location and turn off the ignition.
- Locate the OBD-II port under the dashboard and plug in your scanner.
- Turn on the ignition but do not start the engine. If you intend to spend more than 10 minutes diagnosing your Mercedes-Benz, connect a battery charger or restart the engine and allow the battery to recharge.
- Allow the scanner to power on. Go to Mercedes > Select Model.
- Go to Auto Scan. Allow the scanner to go through all the systems and determine fault codes stored on each one. This will take a few minutes. Enter any of the modules by selecting it—view fault codes.
- Go back once and select Clear Codes to erase any code in stored status. You can not erase the present status codes without fixing the underlying problem.
Generic OBD-II scanners cannot read many modules besides the Engine Control Unit (ECU) and maybe Airbag or Transmission. You need a Mercedes-Benz scanner that can read all control modules. Mercedes-Benz cars typically have 30+ modules installed.
If you are looking to troubleshoot a pre-2000 Mercedes-Benz, you will need a scanner that has supported those models for years and, most importantly, comes with the Mercedes 38-pin connector. If your vehicle does not require a 38-pin connector, the YOUCANIC scanner is the way to go.
We hope you find the Read & Clear Mercedes-Benz Fault Codes DTCs guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.