Replace Catalytic Converter Error code P0420?

This is true, the catalytic converter is part of the exhaust manifold, and it is suggested that the engine must come out to change it out. But there might be work around, an independent shop that could help with the fact that the dealer is not allowed to do so I would check that out.

P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Here are the instructions on how to do the job so you can see for yourself. Check out the images (below). Let us know if you need anything else.