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Do O2 sensors go out of calibration? 700

posted by  Bob Wennerstrom on  Wed Jan 28 13:17 CST 2004
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last visit: Fri Jul 15 12:01 CST 2011
[RELATED]

I'm getting horrible milage in the 760T, like 17 MPG with a relatively light foot. I've got a MBC installed and am running 13 lbs but sometimes drive for days without exceeding 10PSI. I've also got an air-fuel gauge and it's telling me that the 02 sensor is working properly. Just wondering If it can go out of calibration and make the car run slightly rich. There's black sooty stuff on the outside edge of the tailpipe. The wife gets over 25 MPG in her '91 740T. LH 2.4 wouldn't account for that much difference would it?

Thanks,





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