to think it has failed? The downstream O2 sensors are catalyst efficiency
rarely fail. When they do fail, it's usually the heater circuit. If you have a
other than P0141, most times the sensor is ok and the catalyst is starting to
You can verify this by switching the downstream sensors from side to side. If a
then sets for Bank 2, the sensor has indeed failed. If a fault sets again for
one, it's probably the converter.
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