Check engine comes on, goes off, and comes on again. What is the problem?

Asked by Apr 28, 2016 at 02:04 PM about the 2009 Mercedes-Benz CLS-Class CLS 550

Question type: Maintenance & Repair

2 Answers

12,805

Have it read for codes, even if the check engine light is NOT on the computer will have stored information and codes. Discount auto stores will read codes for no fee. Write them down. so many possibilities, why guess? a engine misfire that's intermittent, EVAP system, O2 sensor slow sometimes, on and on. Regards

1 of 1 people found this helpful.
55

Could literally be anything. Best bet is to go by an Advanced Auto Parts store and let them read the error code for free.

1 of 1 people found this helpful.

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