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a failing O2 sensor can present as wandering warm idle or poor MPG.
do you have either of those symptoms?
if so the easiest test is, unplug the sensor and see what changes.
alternatively, has the sensor been changed since youve owned the car, or in the last say 5 years?
if not, just replace it.
944 o2 sensors (if you're not in a super-salt-rust area) take 5 mins or less to swap out, some cars you don't even have to jack the car up first.
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