Had the crankshaft position sensor fail. No run condition. Waited 5 minutes and it started. Took it to MB dealer. Service advisor said that even after replacement of CPS, smog machine will not create a certificate until all "parameters" are reset in ECM. May need to drive the car 20 miles or so. Seems to me that if one replaces CPS and clears check engine light with OBDII device, should be able to pass smog. Sounds like a BS story to me. Anyone have any knowledge of issue? My first MB. Everything is factory stock 62,000 miles.