I have a bad front o2 sensor...it really hasnt messed with the mpg but the check engine light is on and i need an inspection will this cause it to fail?
01-22-2009, 11:30 AM #1
01-22-2009, 11:31 AM #2
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01-22-2009, 11:32 AM #3
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01-22-2009, 11:39 AM #5
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A bad O2 sensor will cause the car to run in "open loop" a safe fuel map (runs very rich air/fuel ratio) to ensure that the engine does not detonate and cause knock.
Rich fuel settings will fail emissions.|Red Wings|Badgers|Packers|
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01-22-2009, 11:45 AM #6
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01-22-2009, 12:18 PM #7
Yes, if your CEL/SES dummy light is on, the emissions computer will automatically fail you.
Also, even if you fix it or get it turned off, you need to complete a drive cycle (25-40 miles) for the code to completely clear out of the computer's history. I once had a CEL the day before an inspection, got it off, failed the next day with the light OFF...had to drive the car around and go back the next day to pass the emmissions part.