1999 Toyota Camry air:fuel ratio sensor

[quote:a9b687115e="david scheiner"]1999 Toyota Camry V6 Front Wheel Drive Automatic 66,425 miles
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my car failed inspection, apparently due to air:fuel ratio sensor problem. My mechanic placed a new one in but the "check engine" light came back on. the new one was putting out only 3.3 volts of power, so my mechanic replaced it again (free of charge), but now the check engine light came on again. The dealership confirms it is the air fuel ratio sensor based on the codes. What else could it possibly be. I've been in and out of repair shops the past 4 days and at my wits end. Please help.[/quote:a9b687115e]

I am currently going through the process of researching my check engine light cause. If the rather cryptic return codes I am getting back from my OBD2 CarCode scanner are to be believed, it is pointing to some sort of A/F ratio sensor problem. From what I know so far, there are 3 sensors on the 1999 Camry. And depending on whether or not you have a late 1999 or early 1999 manufactured car, you either have the later 1999 made "California Emissions Passed" car which uses A/F Ratio sensors or you have the older car which uses O2 sensors. Now getting to your problem... Which sensor did your mechanic replace? There are 3 of them and he replaced the wrong one it seems.

chances are he replaced the wrong one and didn't use the factory sensor. this is an easy straight forward diagnosis and repair. maybe try another shop.

by the way just because its "putting" out 3.3v doesn't make it bad. it works on a 5 volt range vs. a 1 volt for regular o2 sensors.