23-06-2014, 03:57 PM
It could be depending on how these ECUs work. Most with 2 lambdas purely use the second one to see if the cat is working and if not flag up a fault. Others if they detect the cat isn't working then they will still try to correct the emissions as much as possible.
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft