w210 M112 stumble during idle

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w210 M112 stumble during idle

11-24-2007, 10:04 PM

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w210 M112 stumble during idle

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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