[cRiPpLe_rOoStEr]

Originally Posted by Ecky

Here's the big one - there is no upstream catalytic converter. The car has a LEV certification without a catalytic converter. It has a downstream NOx trap and runs the occasional purge cycle to burn off NOx, but it's unmonitored, whereas North American G1s (post 2000) have three O2 sensors, to monitor both the upstream and downstream cats. G1s commonly get a low catalyst efficiency code, and this is one fewer (common) point of failure. I have yet to smell anything from the exhaust, either.

That's quite surprising to me. Does it have only the downstream cat, and only one O² sensor?