Check Engine Light and Engine Misfire on Mercedes-Benz E420

Failed spark plug wires and/or ignition coils can cause intermittent misfires (rough running); the Check Engine Light may also illuminate. Diagnoses of the ignition system will be necessary to determine which components are at fault.

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Average mileage: 127,750 (98,000–157,500)
1 model year affected: 1997
4 people reported this problem
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