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AutoZone is wrong... 99% of the time an O2 sensor code (unless it is a heater code) doesn't mean the sensor is faulty. It means that the O2 sensor is seeing the problem. The problem rolls down hill the O2 sensor is at the bottem of the hill. If you get a downstream sensor code "catalist efficency" the cat is bad. If you have a lean or rich code or a switching code along with one there is a problem with the combustion. Like the air/fuel ratio being off because of a vacuum leak, fuel injector leak, or something before combustion.

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โˆ™ 2006-04-10 03:39:26
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Q: Your 1998 Chevy blazer service engine soon light came on so you ran a diagnostic check it said that the o2sensors were bad so you changed them and reset the codes two days later the light came back on?
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