p0420

Recently got my first check engine light... P0430 and P0420 catalytic converter efficiency threshold codes. Read around on mud and most people pointed to new O2 sensors. Took it to two different shops (both specialize in land cruisers) and both quoted me for new cats... 3600 total. I'm at a loss...

Hello team, My name is Josh and have followed IH8MUD since high school when I got a '90 FJ62. Recently got into a 100 series though, so thanks for being here! I've seen a few threads about threshold error codes with multitudes of suggested fixes, bypasses, and hacks. So I apologize for any...

Hi all, Posting my successful process of clearing my P0430 code on my 2003 LC. awhile back I would get the CE, VSC lights that would stay on for a bit then go away. About 6months ago they came on and stayed on. When I got my oil changed I had my mechanic diagnose it and it was in fact the...

Hello everyone. I've been fighting the dreaded P0420 P0430 on my newly acquired 07 GX470 with 190k miles. I've been searching for days-hoping I can find it's not cats since it's running very well; getting great mileage (18.4 avg on last tank with a light foot in CO) with plenty of power. I've...