SLK/R170: K40 relay module miracle
08-07-2008, 04:08 PM
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1999 SLK 230
K40 relay module miracle
Had the following codes. P1420, 1235, 1236, and P1525. As mentioned, suspect the relay. Took the module out and found bad solder points. Re-soldered and vola, check engine light went out and all power restored to car. Mercedes service center said it was the ECM and possibly the supercharger. Thanks for your suggestions.
