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 the side of the engine near the firewall. Bank 2 near the radiator. Sensor 1 is before the catalyse converter sensor 2 after the catalyse converter. In your case it is the O2 sensor that behind the firewall and after the CC.
Bank 1 is before the CAT and on the left side (driver side) by the manifold.
Oxygen sensor: bank 1 sensor 2.
Mitsubishi Galant, 2002, 4-cyl, O2 sensor, bank 1 sensor 1 (upstream)... PART NUMBER: MR506364
Bank 1 is the bank of cylinders that contain the number 1 cylinder. O2 sensor 1 is the first O2 sensor in the exhaust system between the engine and the catalytic converter.
Bank 1 Sensor 2 is located on the Right Hand Bank - After the catalytic converter. Meaning its on the bank closest to the firewall and after the catalytic converter. Call any Mitsubishi dealer and they will tell you where its @.
The O2 sensor bank 1 location on a Mitsubishi Endeavor is next to the top hose of the radiator on the motor. The sensor is slightly below where the top radiator hose connects to the radiator and on the top of the motor.
bank 2 sensor 2 front bank after the cat
Reset the fuse, and if the light still comes on take it to autozone they will run a free diagnostics check
Bank 1 is where cylinder #1 is. Sensor 1 is ahead of the converter (usually in the manifold.
in front of the cat sensor 2 is after the cat
location bank 1 sensor 1