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well have a look under it and find the cat its the box thats towards the front of the car thats kind ribbed check at the front ontop to see if there is something mounted there and then just after the cat see if there is another one mounted there i try get pics later if you wish
So, Bazza how did they do it? as the ecu needs the difference to exist between the two sensors, without that it thinks the cat is dead and will show warning lights on dash etc, put maps to a safe mode (at a guess)......
.....well, when I went into get my centre section replaced the garage had kindly ordered up the whole exhaust system just incase anything else needed replaced. The CAT section had two muckle CATs side by side, like a divers air tanks, they were HUGE!! I looked under my car when it was on the ramps and I had a one single small CAT. I asked the techy and he said it was the dual CAT was standard for 172s now??
I have sinced checked with three other MK2 owners(2 CUPS) and all have had the single CAT?