The easiest way to do this is to get an OBD II Scanner (Onboard Diagnostic Scanner). This is a diagnostic tool that makes everything simple. Once you buy this, you should look under the steering wheel. Underneath the dashboard, you’ll find a port where you can plug in the scanner. After this, you should turn your key to the second position, but not start your car. You’ll see all the lights come on. Next, get a pen and paper; you’ll need that for later.
Then push READ on your scanner. It’ll give you several different codes, all of which should be written down. This will help you diagnose future problems without having to look up what each code corresponds to which problem.
Words of Wisdom
It’s important to remember to not to panic during these situations. The CEL could turn on due to minor issues like the fuel cap being loose or the radiator being overheated.
Make sure you grab one of the Mercedes diagnostic tools listed above to see exactly what’s causing it!
How to Reset a Mercedes Check Engine Light
If you want to reset the light, there are several ways to do it.
* Connect the scanner to the port and press READ. After the Auto Scan Tool diagnoses the problem completely, press ERASE on the scanner. This will clear all the error codes.
* If your car was built before the 1990s, you can turn off the Check Engine Light by disconnecting the battery and leaving your headlights on for a while. This will drain the current from the car and reset the check engine light. This is a last resort, since disconnecting the battery may erase the memory of several on board components like your radio.
* Fix the problem and the Check Engine Light will go out automatically. That’s the best way to get rid of the light, and the best way to ensure that you have a healthy car.
If you follow these diagnostic tips, you’ll be able to tackle any problems that you come up against. Just remember the diagnostic procedures and you should be able to find a solution every time.