Bank 1 sensor #2 is on the right side after the catalytic converter. What
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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