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,
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
It is the sensor that is screwed into the exhaust manifold on the back of the engine.
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.