Check the NSS by starting in neutral. If that solves it, then thats what needs to be fixed. Had the same problem in the SL, wouldnt start, and magically, it would start again. Bad contact in the switch, cleaned the safety switches, problem solved!

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.