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Would having a failed post cat O2 sensor cause my gas mileage to suc or anything else to my engine ?

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Old 04-06-2007, 09:18 PM
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Would having a failed post cat O2 sensor cause my gas mileage to suc or anything else to my engine ?
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Old 04-06-2007, 09:40 PM
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Old 04-06-2007, 09:48 PM
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I believe that the pre-cat sensors are what control fuel/air ratio. Still should get it fixed though
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Old 04-07-2007, 07:19 AM
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Default Start by replacing the primary O2 and coolant temp sensor
If you've got near 100K miles, a new primary O2 is probably a good idea, even if the existing one isn't causing issues. The car should run smoother and cleaner with a new primary O2.
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