1. Check that all electrical connections on the ignition coils are securely seated.
2. Replace damaged clamps.
3. The contacts should not be wet, otherwise clean the contacts and spray them with an electrical contact spray.
4. Bend the high-tension wires to a tight radius and check for cracks. If not, replace all high-tension wires.
Checking electrical connections (Mercedes-Benz C-Class W202)
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