The engine wiring can degrade because the insulating material falls off leaving the bare wire exposed. This can cause many problems depending on which wires are exposed and what they touch.
Car Problem Reports
Mercedes-Benz C280 Insulation Degrades on Engine Wiring Harness and Leaves Conductors Exposed
Mercedes-Benz C280 Problem
6 Reports
Model Years Affected: 1994, 1995, 1996, 1997
Average Mileage: 104,000 mi (72,000 mi - 136,000 mi)
Verified
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Visitor, 1995 Mercedes-Benz C280, 72,000 mi
Misfire after engine warms up, replaced spark plugs and coil under maintenance, now I read that this is endemic to this year, yet no recall, $2k to repair
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Visitor, 1995 Mercedes-Benz C280, 136,000 mi
Transmission wiring harness is exposed.
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