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- - Oxygen sensor (https://oldsmobileforum.com/forum/alero-21/oxygen-sensor-4266/)

Texasbuddie

Mar 8, 2011 05:31 PM

Oxygen sensor

If the front O2 sensor is bad would that cause the engine to run higher rpm's?

Iflylow

Mar 8, 2011 06:55 PM

It could, but most likely you wouldn't notice it. What problem are you having?

svnt442

Mar 9, 2011 04:20 AM

Not in my experience. Mine is bad right now on my S10 and it's actually running fine. It comes up as "malfunctioning heater bank 2 sensor 1" so I know it's the O2 sensor.

An increased idle is usually associated with a vacuum leak of some sort. It also could be a bad IAC valve.

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