Hello folks!

This is my first post on this forum, so apologies if it's in the wrong place.

If it's not in the wrong place, I wonder if anybody can give me a clue what I ought to do to remedy the P0405 fault code that is on my Audi A4 Avant 2.0 Tdi 2007. The car pulls really well and is not in limp home mode. It does sometimes have an intermittent judder on tick-over.

Thanks in advance,

Paul.