So on the 3.0 litre bank b is the front cat, and bank a is the rear?

Question

Getting code 0420 bank 2 below catylytic threshhold, so is bank 2 the front or rear cat? Thanks..

Answer 1

P0420 Catalytic below threshold Bank 1

The sensor that monitor the catalytic convertor is the downstream 02 sensor these are known as Sensor 2. they are behind the catalytic convertor. When it comes to Banks there is Bank 1 this is always where cylinder 1 is located at. the other side becomes Bank 2, If your going to replace the 02 sensor on Bank 1 use this diagram . The arrow point to the red 02 sensor is for Bank 1