Rear Exhaust and cats issue :(

[Johnny Danger]

Originally Posted by black_box

Do you know how that system is monitored? The US system has the lambda sensor after the primaries on a 2001. Does the UK have them after the "secondaries" but fore the muffler?

I am planning to RoW flash mine after putting the clutch and transmission back in, so I'm interested in how the whole thing is monitored for that DME image. I was under the impression that it only monitors the precat lambdas, so no CEL for cat delete.

It's my understanding that many RoW vehicles do not have pre-cats on the headers . Rather, they only have only the secondaries . As far as where the 02 sensors are, I suspect that they're similarly located - fore and after the cats .