Question about 2001 Buick Regal
2001 buick regal LS 3.8 Non-Supercharged. Had bad ignition coil and plugged catalytic converter. Changed coil, converter and downstream oxygen sensor. Should I change the upstream oxygen sensor too?
Hello! The defective ignition coil more than likely contaminated the downstream O2 sensor...If there isn't a trouble code and engine performs in a normal fashion, there's no reason to change the upstream sensor...
Posted on Aug 03, 2010
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Posted on Jan 02, 2017
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