Diagnostics An oxygen sensor that’s going bad or has failed altogether won’t always throw a check engine light or trip a diagnostic trouble code. Sometimes if there’s an internal problem ...

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I had a test done at local auto-parts store that showed a code of PO138. They told me this indicates a problem with the oxygen sensor. I replaced the oxygen sensor and the light never went out.

William J. Fleming, Temperature Sensitivity Mapping of the Zirconia Oxygen Sensor: Engine Test Results, SAE Transactions, Vol. 85, Section 2: 760163–760429 (1976), pp. 1423-1427 ...

The new sensor, on the other hand, is a practical all-rounder: it is very sensitive, can detect molecules of oxygen among a million gas particles and does so reliably even at higher concentrations. It ...