those codes are for the catalytic converters: p0420-bank 1 cat, p0430-bank 2 cat, p0440 is the cat in the y-pipe. Dont recommend using sims which can cause further issues down the road, when i got those codes, i replaced the cats with aftermarket performance catalytic converters. i got magnaflow hi flo cats. spent a pretty penny but they were worth it
Trouble Codes P0440 P0430 P0420
in 01 - 06 Lexus IS300
Posted
those codes are for the catalytic converters: p0420-bank 1 cat, p0430-bank 2 cat, p0440 is the cat in the y-pipe. Dont recommend using sims which can cause further issues down the road, when i got those codes, i replaced the cats with aftermarket performance catalytic converters. i got magnaflow hi flo cats. spent a pretty penny but they were worth it