Bad O2 sensor but no codes??? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 03-18-2005, 12:53 PM   #1
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Default Bad O2 sensor but no codes???

My 1990 Bonneville LE has been getting really bad gas mileage lately, about 15-17 mpg. I don't drive hard and have a mix of highway and city driving. I need to get at least 22 mpg, which is what I usually get. Last time the mileage got this bad was about a year ago and the check engine light was on so I replaced the O2 sensor.

I needed it quick to pass emissions so I just went to Autozone and bought a Bosch (I know it isn't a good one ), what is the good brand to get, and is that what I need to do?

Thanks! Tom
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Old 03-18-2005, 01:08 PM   #2
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Sounds like the Bosch unit has tanked on you... I would be willing to replace the sensor again...

But this time Get an AC Delco O2 sensor instead... I have had bad luck with Bosh products in generall on the bonnevilles... But the AC Delco parts have given me no issues... Both of my bonnies do 20-21 in town... 30+ on the road

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