Questions & Answers for: Buick post catalyst Computers & Internet

...catalyst efficiency by comparing the switching activity of the upstream and downstream oxygen sensors in the exhaust. The upstream O2 sensor in the exhaust manifold reflects the condition of the ...

...are not configured correctly need diagram the battery cable won't stay tighten to the battery post. What causes this to happen. Also the catalystic converter is plugged what can you

...catalyst efficiency error. Did correct run time for cat to lite up, checked 02 operation and the post 02 sensor wasn't switching properly. Replaced. Week later still getting code. Checked for ...

...post-catalyst oxygen sensor signals while adding and subtracting fuel during specific idle conditions. The PCM compares the pre and post-catalyst-oxygen sensor signals to determine if the oxygen ...