You can check the codes yourself. Search this forum for the code reader you can build.

Don't touch the A/F mixture yet as stated above. Fix the CEL first before moving onto other things.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k