Join Date: Dec 2005
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The cat won't cause any running problems until it starts to break up and block the exhaust,but you will get plenty of warning of this(rattle from exhaust first...).The second sensor only checks the cat is working and won't effect the running either...
Good luck and let us know how you get on.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo