2001 Mercedes-Benz C-Class - CEL on for 12 years

I have a c240 Mercedes 2001. My check engine light has been on for the last 12 years permanently . The car drives fine . What should I make of it . Several mechanics have looked at it and find nothing

If the3check engine light is on, there is a code that can be retrieved from the computer. Either the mechanics failed to tell you what the codes are or you have a faulty check engine light. A faulty light is pretty much inconceivable.

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