2001 Buick Regal o2 sensor

2001 BUICK REGAL
136,000 MILES
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CHINESE FOOD
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I had the exhaust resonator replaced and the check engine light came on shortly afterwards. I replaced the o2 sensor on the manifold and the o2 sensor is still showing incomplete on the mechanics engine scanner. Should I replace The o2 sensor after the converter?
Sep 9, 2013 at 12:09 PM
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HMAC300
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what is the code and what engine size? you may have replaced the wrong one.
Sep 9, 2013 at 12:14 PM
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CHINESE FOOD
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It's a 3.8L Supercharge. No code is showing. It's just telling him that the 02 sensor and evap is Inc. I downloaded the info you have already emailed me and he wouldn't even look at. I'm frustrated and confused. I can't figure this problem out
Sep 9, 2013 at 12:22 PM
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HMAC300
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is this the one with the monitor problem? I thought that it was explained to you if you can't get satisfaction at your shop then go to another place. that may be a problem with the ecm or a bunch of other things, air leaks will also set that code since you've had the resonator replaced it may have one.
Sep 9, 2013 at 12:26 PM