You have four sensors on the truck, two before the catalyst converter, which you have two of, one on each side. Sensor 1 is the first one in line before the cat, sensor two is after the cat. Bank 1 is the driver side exhaust system, bank 2 is the passenger side. That being said, your sensor is the first one on the driver side.
where is the O2 sensor on a 2002 chevy trailblazer
O2 sensor bank 1 = cylinder 1 side, prob driver side sensor 1 = before cat converter so up front before the converter
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.