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02 Sensor Question

Old Oct 2, 2011 | 08:58 PM
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JMac202's Avatar
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Joined: Sep 2010
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From: F'n Kansas
Year: 2000
Model: Cherokee
Engine: 4.0
Default 02 Sensor Question

Would a bad 02 sensor throw a CEL or can it go bad without throwing one? Mainly the upstream one.

I get terrible gas mileage in my Jeep. Around 10-11mpg with only a 3" lift and 165/75 tires. I know it's not a Hybrid or anything but Id like to think I could get 14-15mpg.
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