The Bank 2 O2 sensors on a 2002 Mitsubishi Diamante refer to the oxygen sensors located on the side of the engine that does not contain the #1 cylinder, typically the passenger side. Sensor 1 is the upstream O2 sensor that monitors the air-fuel mixture before it enters the catalytic converter, while Sensor 2 is the downstream sensor that checks the efficiency of the catalytic converter after the exhaust gases have passed through it. Issues with these sensors can trigger the check engine light and affect engine performance and emissions.
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.
On a 2002 Mitsubishi Diamante, the bank 1 sensor 2 oxygen sensor is located on the exhaust system, downstream of the catalytic converter. Specifically, you can find it on the exhaust pipe, closer to the rear of the vehicle. It is usually mounted in a threaded bung and may require some effort to access, depending on the vehicle's configuration.
On a 2002 Mitsubishi Diamante, bank 2 sensor 1, which is the upstream oxygen sensor, is located on the exhaust manifold on the passenger side of the engine. It is positioned before the catalytic converter and is responsible for monitoring the air-fuel mixture for that bank of cylinders. Accessing it may require some maneuvering due to the engine layout, but it is typically reachable from the top of the engine.
Mitsubishi Galant, 2002, 4-cyl, O2 sensor, bank 1 sensor 1 (upstream)... PART NUMBER: MR506364
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 where cylinder #1 is. Sensor 1 is ahead of the converter (usually in the manifold.
Sensor 1 is before the cat
Oxygen sensor: bank 1 sensor 2.
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.
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 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.