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My car has been throwing O2 sensor errors for a while but still engine worked ok. One day it showed "+1 qt" for oil, I went to the dealership and added some oil. Right after that I got rough idle and vibrations at low rpms.
Rheingold doesn't show any errors other than O2 sensor failure and misfires in cyl 1-3. Interestingly, no one mentioned if rough idle and misfires can be caused by a faulty O2 sensor and I guess I will find out if it was the problem or not soon...
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