You also can press the button right next #1
key on or engine running press button and hold 2~3 secods count how many blinks if blink three times (code #3) if blink 5 times
(code #5)......after you read all the code
or after repair is done press button again hold it for 8~10 seconds to reset check engine light.

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MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner