Hmm,

The dealer disconnedted "everything", cleaned the connectors, then reconnected everything. Seems to work. Since my fault is intermittent, it is hard to know. However, the passenger-side sensor is definitely not working, which may be the underlying cause.

Momo

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1990 500SL 65k km - until May 11 2004
2004 E320 4-Matic wagon
2004 CLK500 Cabrio from May 11 2004