Car Problem Reports

Mercedes-Benz C220 Insulation Degrades on Engine Wiring Harness and Leaves Conductors Exposed

Mercedes-Benz C220 Problem
15 Reports
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Model Years Affected: 1994, 1995, 1996

Average Mileage: 147,868 mi (72,000 mi - 276,000 mi)


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.

  • Visitor, , 99,700 mi

    Rough idle, engine misfires above 3000 rpm. Inspected wire harness and noted degraded wire insulation causing intermittent shorts throughout the entire harness. Dealer wanted $800 for the harness and 5 hours labor at $130 per hour, I purchased the Mercedes OEM harness through ECS Tuning ( for $608 and installed it in 6 hours. Fired right up and runs smooth as new.

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  • Visitor, , 153,000 mi

    engine wiring harness failure. Had car since new, 100% services and wanted to keep but it is worth $2500 whoesale but cost is excessive to replace wiring harness. what is cheapest fix?

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  • Visitor, , 180,000 mi

    wiring harness degrading

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  •  Rookie

    $965.25 parts, $780 labor = $1745.25
    Blue book private party value for car is only about $2500
    Will look for a less expensive fix--perhaps $608 for part plus 6 hours self labor, as noted below.

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  • insulation was coming off wiring of the C220. Engine and transmission wiring harness needed to be replaced.

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  • Visitor, , 72,000 mi

    I noticed my c220 1995 model had difficulty in running. later we observed it was on plug 2 and 3 that were firing so i replaced the coil. Shortly after that the same problem started again so i changed the air flow meter to no avail. But i later found out that my amnestic cable was bad because the insulators were flaking off so i changed the entire cable. Unfortunately for me the car entirely stopped running only to be told my brain box has gone bad. Now i have tried getting a new brain box of same cord number but the car would not run. A different cord was discovered to run with it but running is not smooth and temperature rises above normal. This is giving me serious heart ache and i know not what to do next.

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  • Visitor, , 120,000 mi

    Needs a new wire harness

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  • Visitor, , 99,988 mi

    Replaced the wire harness, when touching the old wires they would turn to powder

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  • Visitor, , 252,000 mi

    i almost died on the freeway when the car stopped in the fastlane and a car hit me due to the wiring harness being faulty. MB needs to acknowledge this and make it a recall the cheapest i seen the parts for is $450 on ebay

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  • Same Problem. New wiring harness is the only fix.

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