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Mitsubishi Galant, 2002, 4-cyl, O2 sensor, bank 1 sensor 1 (upstream)... PART NUMBER: MR506364
There is no bank two on this van.
Bank 1 is the pass side.
Yes.
P0155 = O2 sensor heater circuit malfunction (Bank 2 Sensor 1). All O2 sensors are threaded into the exhaust system at various points. Bank 2 would be the bank of cylinders that does not contain the #1 cylinder. Bank 2 Sensor 1 would be the first O2 sensor leading from bank 2 of the engine.
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,
The bank 1, sensor 3, O2 sensor would be the O2 sensor post cat.
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.
You did not specify which O2 sensor it is. Is it sensor 1 bank 1, sensor 2 bank 2, sensor 2 bank 1, or sensor 1 bank 2. There are four O2 sensors on a mazda 626
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.