The turbo went on my 99 VW Passat and I am now driving our third car, the 99 Forster. The car has gotten little use over the last year. I notice now that I have been using it day to day that it is going through more fuel than it had in the past. I know the cat is going (not plugged yet) due to the CEL code. Could this be it or is there something else I should be looking at? I have changed the air, fuel filter and plugs not so long ago. The car has 164 K on her. It does go through a little oil and probably is the cause for the cat going. I do plan on taking the cat off and taking out the innards for beter flow. So what should I be looking at?