Bad 02 sensor or need a tune - Mustang Evolution

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Old 09-29-2015, 07:48 PM   #1
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Bad 02 sensor or need a tune

This will be my first mustang its a 06 mustang gt its showing to have a bad o2 sensor and the guy says its idling bad when he cranks it up and at a stop but it also has a steeda cold air intake and it was on there wen he got it. He doesnt know if its had a tune for the steeda and ive heard that without a tune it can really make it run bad. I would love to buy this car but really dont know if its the o2 or needs a tuner is there any way to tell before i buy it?
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Old 09-30-2015, 03:21 PM   #2
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There should be an error code if it's an O2 sensor. Depending on whether it's an upstream or downstream sensor, i.e. #1 or #2, it might also be responsible for the poor running. An upstream or #1 sensor affects the mixture whereas the downstream sensor (it's only there to check catalyst function) does not.

Any OBD II code reader will tell you.
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