Ok guys, this is really getting my goat now.
Since xmas last year the g/f car has been having problems, first the exhaust broke. Got it replaced, then the emissions system has been playing up ever since.
Replaced the CAT, replaced the pre and post cat sensors. (rear is NGK, front is Bosch)
However, no matter what we have done this code keeps reappearing.
16804 - Catalyst System; Bank 1: Efficiency Below Threshold
P0420 - 35-00
I clear it, and roughly 400-500 miles later the ECU light comes back on and repeats the code. It's doing my head in.
Can anyone help at all? I've looked at the internet help for all of it and it's not helping.
Toph? Can you and the R-Tech guys do an ECU flash on it? Or take out one of the sensors from the ECU?
Cheers everyone.