Any other codes, or just that one?
This particular code means that the catalytic converter on Bank 2 isn't working properly. Bank 2 is the side of the motor opposite from where cylinder #1 is.
This is typically one of three things:
- Bad cat
- Bad O2 sensor
- An exhaust leak
I'm not a professional, but if it were my truck I would:
0. Figure out where cylinder #1 is, then inspect the opposite side of the motor...
1. Verify that there are no exhaust leaks anywhere: At the engine, engine/manifold connection, manifold/y-pipe connection, in the Y pipe/cats, at the exhaust/cat connection, etc.
2. If you don't find any leaks, then I would verify the O2 sensors by:
a. swapping the pre-cat O2 sensor with the one on the bank 1 side of the motor. Then, recheck the codes. If the code followed the sensor then it is the sensor and not the cats. b. Rinse and repeate a, with the post cat O2 sensor. 3. If you don't find any leaks and the codes don't follow the pre-cat or post-cat O2 sensors to the opposite bank when you switch them, then I'd assume it is the cats and have someone replace them. Not sure about your truck, but this is all work that can easily be done by someone with a Land Rover Discovery. The O2 sensors typically connect with a plug, maybe attach to a wiring harness to keep them away from the hot enging, and usually screw into the exhaust. A set of wrenches is usually all that is needed to remove them. Craig |