its the 1 on the exhaust manifold pointing out towards the front of the car. i just replaced it on mine
Mitsubishi Galant, 2002, 4-cyl, O2 sensor, bank 1 sensor 1 (upstream)... PART NUMBER: MR506364
it should be the bank facing the front of the car in the manifold. you should be able to find it right in front when open the hood
P0135 on Mitsubishi galant 2003 Definition: HO2S 11 Heater condition (Heated Oxygen Sensor Bank 1 Sensor 1) Explanation: The powertrain control module monitors the oxygen sensor heater. The computer has recognized a failure in this ciricuit. Probable Causes 1. -Oxygen sensor defective 2. -Poor connection at oxygen sensor 3. -Check circuit-fuse
in front of the cat sensor 2 is after the cat
Sensor 1 is before the cat
bank 1 is the first oxygen sensor coming down from the engine. bank 2 is the one furthur back installed into the exhaust system. if bank 1 gooes, your ar will ride horrible. f bank 2 goes, it will run alright but you will be buring alot of fuel and losing soe power
Bank one refers to side where ! 1 cylinder is and the sensor 2 is the rearmost(at the converter outlet).
Oxygen sensor: bank 1 sensor 2.
towards the middle of thecar installed into the exhaust pipe
The bank 2, Oxygen sensor 2, on a 1999 Mitsubishi Diamante is located on the passenger side of the vehicle. It is in the exhaust in the undercarriage.
Bank 1 is where cylinder #1 is. Sensor 1 is ahead of the converter (usually in the manifold.
the part number should be md354851. the Mitsubishi suggested retail price is 167.77. Keep in mind it is always a good idea to check the part number with your local Mitsubishi dealership. Have your vin number ready cause most likely they will be asking for it.