Secondary o2 sensor cel after exhaust install?
I just put a cat back on my 99 Honda accord with the f23a1 and it set off my cel immediately. I unplugged the battery and it fixed it for a few hundred miles and now it's back on. The first time it was running rich, I'm not sure how the air/fuel ratio is now. Do I need to upgrade my o2 sensor? I could replace it with an oem denso o2 sensor or something better like an NGK.
News Flash: Your car has two oxygen sensors. One between the exhaust manifold and converter and the other is behind the converter. Advance Auto has OEM Denso oxygen sensors.
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