It depends on the year, make, model, and engine. They are always in the exhaust stream near the engine.
where is the secondary 02 sensor on a 2004 crv
exaust leaks , faster if its before the 02 sensor
P0139 02 Sensor Circuit Slow Response (Bank 1 Sensor 2)P0139 02 Sensor Circuit Slow Response (Bank 1 Sensor 2)
02 sensor
underneath the cam rod with the 02 sensor
That is the sensor in the catalytic converter.
That would be the sensor in the exhaust after the catalytic converter ( downstream )
That would be the sensor after the catalytic converter.
02 sensor heater curcuit malfunction (bank 1 sensor1)---change front 02 sensor if need be.
You have a bad 02 sensor after the catalytic converter.
where is the 02 censor located
you do have an ( 02 ) sensor on the exhaust system