newtonhubcap

Good morning all, I have a 98 A4 quattro with 2.8l 5 spd. Car has 137,000. I have done a lot to the typical maintenance type work on the car since I purchased it. Car has ran fine till the cel came on. Ran code with vagcom and had the p1141 code (implausible calculation). I have replace all the vacum lines (silcone base hose) and the MAF.

I did check the inlet temp into the catalytic DS 249F and PS 253F and post catalytic temp DS 246F and PS was 165F. Having such a large difference on the outlet temp the ps I assume that is a good indicator the catalytic is plugged and would the cause the p1141 code to be thrown.

Apprecaite any thoughts.