Car is in with eng management lamp on checked out and only code listed was P0420 catalyst efficency below threshold volkswagen code 16804 had this code before on a seat and never got to the bottom of it and they seem to have a complex lambda sensor setup on them, we fit a cat to the last one but it did not stop problem any help would be greatley appreciated.

As you can see I have uploaded freeze frame data image this fault only occurs now and again thanks again Malcolm