W124 E420 Check Engine - comes on every third start

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W124 E420 Check Engine - comes on every third start

01-01-2009, 11:01 AM

gsxr

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Join Date: Aug 2001

Location: USA

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Click here to download my DTC (Diagnostic Trouble Code) guide for your car (1MB, PDF format). As Doc said, you need a scanner, or at least an LED blink code reader, to see what codes are on the other computers. The built-in LED only shows very vague, generic codes from the DM (diagnostic module). Code 17 on the DM means "Data exchange malfunction between individual control modules", which - also as Doc said - means nothing by itself.

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