Quote:
Originally Posted by sbourg
I also have a CA 1991 190E 2.3 with a check engine light on. I cannot get the test LED to do anything. The service info says that a condition is that the check engine light must be off. How can I do that without also clearing the codes? Thanks.
Steve
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Turn key all the way to the right, but dont turn on the engine. Go press and hold the LED button for 3-4 seconds and release. After the light is done blinking. Press and hold the LED for 10-11 seconds. There will be one long blink. Do this untill the LED only blinks once after holding the button 3-4 seconds. In the future do a search and if you can't find the answer, you should create your own thread instead of hijacking one. Cheers.