Bank 1 is the pass side.
O2 sensor circuit low voltage (bank 2 sensor 1)
Trouble code P0155 means: O2 Heater Circuit (Bank 2, Sensor 1)
back 2
Above cat pass side.Above cat pass side.
Bank two sensor two on a 2002 Ram is passenger side, after the catalyst.
looking at the car it's on the left side, past the cat, under the air filter box
Trouble code P0131 means:O2 sensor circuit low voltage (Bank 1 Sensor 1)
Trouble code P0340 means: Camshaft Position Sensor A Circuit (Bank 1 or single sensor)
It means oxygen sensor bank 2, sensor 2. Before replacing parts you will need to check for vacuum leaks. Just because you have a code it doesn't necessarily mean that part is defective.
Trouble code P0544 means:Exhaust gas temperature sensor circuit (Bank 1)
Bank 2 is the driver side.Bank 2 is the driver side.
i would suggest changeing out those injectors.