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how to fix the engine diagnostic warning lamp light come on and off?

mercedes A-Class 2006
nick, May 2010
If the warning lamp comes on its because the computer has detected a fault or faults. It would be impracticable to provide a warning lamp for every fault so one for each system is used. Diagnostic tool is required to help pinpoint the problem.

mags, May 2010
You have to have the fault read Kwik fit or a local garage can do this for aprox £20 but then it has to be re-set pnce fault fixed

JB F1, May 2010
link Click here to see other fixes for Mercedes.