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o2 sensor question

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Hi guys I recently bought a cheap automatic 1997 Legacy 250T wagon to use as a run-around while down at university. Lately it's been stopping (stalling, i guess) randomly. Generally this would happen when pulling out of park, soon after I start her up, but there have been 1 or 2 times that it happened while travelling on the open road. I've noticed that it seems to happen more if the cars been sitting in the sun all day, or if I start it up when still warm, though that could easily be a coincidence. Other than that, the only thing I have noticed is some hesitation when accelerating.


When the check engine light came on, I pulled the code which indicated a faulty oxygen sensor. I've read in a few places that stalling is a possible symptom for faulty o2 sensors, though no where explained why? When I took it in to my mechanic today, he seemed pretty skeptical that that was the issue too, but I was wondering if anyone had any opinions or could elaborate on why a faulty oxygen sensor would cause a car to stall?



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