as above i guess except the knock sensor only goes off on bank 1, both cats banks go off though.

ive had lean issues for a while, my LTFT is at around 10% across the rev ranges.

if i wanted to replace my Cats, is this one of those things where only LR cats will do? Or will an aftermarket one be fine?

also only happens on motorway driving, i'll be cruising for a while at 70ish. then think a nice overtake coming(no camera zone ), i foot down and next thing ya know boom ive got no power because a knock sensor codes gone off and restricted the power, but no check engine or reduced engine mode.

i clear the pending code and the power is back.

this car is fitted with lpg but hasnt been used for a good 600 miles and i reset the adaptations to ensure lpg wasnt screwing anything up.

also watching the misfire counters in real time, the car seems to misfire when i come off the throttle but they normally reset to 0

also it has new sensors, upstream and downstream.

I wouldn’t be changing cats while you have problems. (Unless you think they are blocked)

Knowing these it probably is fussy on the brand !

ive been told blocked cats can cause lean condition. but i dont quite understand how.