My 1999 E320 wagon (140,000 km) stumbles once in a while while at idle.
It happens after the car has warmed up. RPM's drop and dash lights dim, but the car does not stall. Check engine light is not on. I havn't checked for codes yet.
Could it be the O2 sensor?
AMM and O2 sensor are original

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2012 ML350 Bluetec 4-matic
1999 E320 4-matic Estate


"A ship in harbour is safe, but thats not what ships are built for". - John A. Shedd

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