I have a 2012 E350 4matic. I bought it used three years ago, never had problems, got regular service, and Thursday of last week, my check engine light came on. After taking it to a Mercedes dealership, iI bought it used three years ago and Thursday of last week my check engine light came on. After taking it to a Mercedes dealership for second opinion, it is stated on the invoice that they inspected wiring harness and found that the ME has a puddle of oil in the connector. Harness and...
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