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Old 02-25-2004, 12:37 PM   #1
Ging
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Default Driving w/o Rear Oxygen sensor?

What would driving w/o the Rear O2 sensor do? Is the ECU smart enough to compensate. I'm guessing gas millage would suffer.

Thanks.
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Old 02-25-2004, 01:13 PM   #2
North Ursalia
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The ECU was never designed to compensate for broken/failing sensors, nevermind missing sensors.


Brian

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Old 02-25-2004, 01:56 PM   #3
Ging
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I'm assuming then that with the rear sensor being completely broken, that your car would just drive really poopy then?
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Old 02-26-2004, 10:20 PM   #4
iceNine
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As far as I know the rear sensor is only there to monitor cat efficiency. If it were broken or missing then you would get a CEL but I don't think that your car would run badly. Now if the front O2 sensor was bad that would cause problems since the ECU uses that to determine fuel mixture and other things. Many people with catless exhausts run without the rear O2 sensor or with CEL fixes without any drivability problems.

Dale
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Old 02-26-2004, 10:24 PM   #5
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Yeah, in my experience a missing or malfunctioning rear oxygen sensor doesn't affect drivability. Brian's right that the ECU isn't meant to compensate for failing sensors but Dale's right that the rear oxygen sensor doesn't affect how the ECU behaves (other than the potential for trouble codes).
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