Date registered: Jan 2011
Vehicle: 2008 C200K (W204) & 1998 SL500 (R129) Imperial Red
Location: Johannesburg, South Africa
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Soybean / Biodegradable engine wire harness on 91 - 94 models?
I know that the very fist batch of W140 models that were built from 1991 - 1994 had a manufacturing flaw of the infamous "Biodegradable engine wire harness"
Due to high heat in the engine bay and age, the insulation on the wires dries up and crumbles off, leaving there wires bare to short-circuit with the other wires running parallel.
Most common is that the main, upper engine wire harness is the one which inevitably fails. It causes all kinds of major problems when failed.
MY QUESTION IS:
Are all the wires in car insulated with the same form of biodegradable insulation?
Are there any other wire harnesses that also fail due to this manufacturing flaw? Eg: Lower engine harness, electric mirror wires, interior electrics, etc?
2008 MB C200K (W204) Avantgarde - Weekday car
1998 MB SL500 (R129) Imperial RED - Weekend car
Other various MB's previously owned:
W140 - W210 - W210 Estate - W202 - W203 - W203 Estate - R170 - W211 - W123 coupe