Originally posted by mithra
last that I talked to dealership, the tech was checking the wiring harness to verify its integrity.
If your wiring harness was not replaced - do it. The engine harness on 600 is easy DIY job. Also check the harness to the MAF on both sides. It was realy bad on my 92 600SEL. It is available as a repair harness - just two connectors to the MAF and wires to the computer with crimped pins. Let me know if you need p/n for it.