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I did the same; replaced both cats along with 02 and A/F sensors and have not had any problems. Also noticed a increase in power and mpg's. Now what I've been told, correct me if I'm wrong, but the cats should almost never go and that there is usually a different underlying problem that should...

Any other ideas? I cleaned incoming air sensor, tested A/F sensor (tested good), replaced downstream o2 sensor, checked for any exhaust leaks (didn't see any), but I'm still getting P1135, P0420, P0420 p/d

So I cleaned the incoming air sensor really well, still have the same codes (P1135, P0420, P0420 p/d). Obviously to save as much $ as possible I want to avoid replacing the cat, but right now I don't know what else I can do

Thanks I'll give that a shot, never thought about cleaning the incoming sensors

I'm new to this site, looking for a little help Just bought my first Tacoma (2002 V6 4 Door) a few months ago, already having a couple issues. A few weeks ago I got a P0141 code along with a P0420, I replaced the downstream 02 Sensor, ran it for about 100 miles, now the light...