Thank you.
I have recently replace the Throttle body controller?? (throttle body something) and the aft O2 sensor. Does this jive with the Cat news??

My mechanic told me that i'm probably going to have to replace my cat. My question is can I purchase an after market one or should I buy one at the dealer, he always speaks ill of after-market products. This is my first Volvo, and as you can imagine my indoctrination into European cars was not what ...