OBD II magic?? or ECM?? or HELP - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 09-26-2006, 05:53 PM Thread Starter
BenzWorld Junior Member
Date registered: Sep 2006
Vehicle: 99 SLK 230
Location: Boone, NC
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OBD II magic?? or ECM?? or HELP


Here's one that's baffling me. Check this out. I have a 99 SLK 230. When I get an OBD II reading it shows PO341 (Camshaft Position Sensor Circuit Range/Performance) and PO 100 (Mass or Volume Air Flow Circuit Malfunction) The Check Engine Light burns and the car runs poorly and stalls out after a 15+ min. warm up.

Here's the strange: (The engine is off) When I turn the key all the way to the right (dash lights all on) but not the final twist to start - then I clear all the codes out to pass - then I twist it to start - car starts and no check engine light and the OBD II shows pass and the car runs perfect. I drive it etc. - Never a check engine light and perfect Pass OBD II.

But when I turn the car off and restart it - the check engine light / codes come back and I am back to where I was before. - unless I do what I mentioned above.

Its like magic if I clear with the OBD II with the position the keys twisted - it like bypasses the computer to find a code etc.

Why won't this hold? Could the ECM or another electric part need replacing?

What should I try? I think it might be one of the computers or a wire????
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