Right at the inlet to to the catalytic convertor where the exhaust pipe enters.
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Mitsubishi Galant, 2002, 4-cyl, O2 sensor, bank 1 sensor 1 (upstream)... PART NUMBER: MR506364
Bank 1 is the pass side.
Yes.
That engine is a straight six cylinder so follow the exhaust pipe from the engine exhaust manifold to the first sensor you see threaded into that pipe, that would be the bank 1 sensor 1 o2 sensor.
Bank 1 Sensor 2 is the sensor AFTER the catalytic converter. Causes could be,A faulty O2 sensor, Exhaust leak near the sensor, Damaged catalytic converter, Damaged wiring to O2 sensor,
It is the sensor that is screwed into the exhaust manifold on the back of the engine.
Trouble code P2A00 means: O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Trouble code P1172 means: A/F SENSOR CIRCUIT OUT OF RANGE HIGH
O2 sensor circuit low voltage (bank 2 sensor 1)
Passenger side exhaust pipe directly after the exhaust manifold.
Passenger side and after the catalytic converter O2 sensor.
Trouble code P0132 means: O2 Circuit High Voltage (Bank 1, Sensor 1) Replace the upstream O2 sensor (cylinder 1 side)
Bank 1 sensor 1 is closest to the firewall and located just below the exaust manifold. Easiest to change from under car.