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Old 06-15-2007, 06:45 AM
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Join Date: Jun 2007
Posts: 2
Oil contamination of ECU

My father has a CLK230 Kompressor year 2000 which is currently showing the engine management light on the dashboard. He has consulted a local garage and been told oil has infiltrated the plugs and harness/loom through capillary action from the camshaft and oil has entered the ECU. The diagnosis is to replace the ECU, harness/loom and oxygen sensor at a cost of around 1500. Has anyone experienced this problem before? Apparently it is a a common fault? Is 1500-2000 the only option?

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Old 06-15-2007, 07:23 AM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
I have read about this problem a few times on the German M-B forums.
Seems the only cure is to replace the parts you have mentioned.
Once the camshaft sensor develops a leak, there is a "wicking " action, that allows oil to migrate right up and into the ECU.
I would try spraying some Brake Cleaner ( it will almost instantly evaporate & carry the oil away ) into all accessible places & see what happens.
2007 C 230 Sport.
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Old 06-15-2007, 09:49 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
if that car is an auto trans i would check the trans computer as well.they are well known for the problem which i have personally seen several times.
David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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Old 06-18-2007, 10:05 AM
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Join Date: Jun 2007
Posts: 2
Smile Thanks

Thanks for the info guys - very helpful. Cheers Clare
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Old 06-18-2007, 02:43 PM
Parrot of Doom's Avatar
1997 W210 E300TD 243,000
Join Date: Mar 2006
Location: Manchester, UK
Posts: 983
Before you buy any new ECUs, clean the existing one out with alcohol. You'd have to be incredibly unlucky to damage a PCB or any components with mere oil, potentiometers are one exception but they're cheap to replace.

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