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bad o2 sensors w/o a code??

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Old Dec 13, 2004 | 11:32 AM
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Jonny98max
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bad o2 sensors w/o a code??
i am gettin about 20 mpg on my 98 5spd with 95% highway driving....ive recently replaced my KS.....plugs....and filters....i was wondering if o2 sensors can be bad and NOT pull a code....
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Old Dec 13, 2004 | 11:53 AM
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Originally Posted by JLiusifer
i am gettin about 20 mpg on my 98 5spd with 95% highway driving....ive recently replaced my KS.....plugs....and filters....i was wondering if o2 sensors can be bad and NOT pull a code....
i think a bad o2 sensor always set off the CEL...well, that's what the CEL on my car is telling me
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Old Dec 13, 2004 | 12:10 PM
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Bad O2 sensor = CEL
Dying/used up/"slow" sensor = bad MPG
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Old Dec 13, 2004 | 12:33 PM
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well i guess i dont kno what could be causing me to have bad gas mileage then.....ive already replaced everything besdies the o2's......anyone know?
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Old Dec 13, 2004 | 12:36 PM
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I would just replace the 02 sensor. It might be going bad but not bad enough to trip the cel.
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Old Dec 13, 2004 | 12:39 PM
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How many miles you got? It's probably O2 sensor changing time. Check the group deal thread for the GD (got mine from there)
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Old Dec 13, 2004 | 03:06 PM
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JoeB
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O2 Sensors die slowly and may not trip a code until they completely die. Mine had a 165k on them and where completely plugged up and not throwing a code. When I replaced mine I got 5 mpg back.
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