Bad cats?

Hello. Im new to this but i could really use your advise. The engine lights on, took to autozone and the cat codes appeared. 05 prerunner v6 . 200,000 miles about. I have changed all the 02 sensors. And cleaned the AFR sensor. The engine light goes off and on. Its not on all the time.

 

what are the specific codes? post it up so someone with the same code can help. for the most part if the codes are particularly pointing to bad catalytic converters and you already replaced the O2 sensors, then you'll have to replace the cats.

 

p0320

 

Anybody tried cataclean before?

 

hhmmm...usually a code like p0420 would be related to cat. that code seems to be crankshaft position sensor. https://repairpal.com/obd-ii-code-P0320 . what are you experiencing with your car?

 

have to fill the tank more often.

 

im sorry it was p0420 and p0430

 

I'm having the same code. Trying cataclean on my way ho,e from work today. Will let you know if it helps.

 

hhmm....clean your MAF and reset the ECU. but those codes are usually cat related. your a/f mixture isn't right. you might be running rich.

 

Ok here is the update and what I did . I did a ton of reading and youtubing . At 1/2 a tank I added a gallon of lacquer thinner . Drove to work and back . Bout 80 miles . Then at 1/4 tank I added the cataclean . Drove about 30 miles . When to parts store and cleared all codes . My 0420 code was gone . It seems to have worked . My other codes are speed sensors. Got parts ordered to fix that .

 

Good news - keep us updated on the long run - is there any possible damage to the motor from burning lacquer thinner or cataclean ? Thanks for any reply.

 

Not that I have heard or read. I sure the hell hope not. Will keep y'all posted

 

Thanks.

 

Well after driving about 75 miles my code 0420 came back . So the cataclean didn't work for me . Just picked up a new O2 sensor going to give that a try before I start cutting out converter's

 

I have replaced 3 of the 4 02 sensors with no luck code still on. Did you really put paint thinner in your tank?

 

Sure did. Didn't seem to help a dang bit

 

I have also cleaned the MAF sensor. Im in California so I have to buy carb compliant converters.. Im just trying to save some dough.

 

https://www.tacomaworld.com/threads/exhaust-manifolds-with-cats-air-injection.500898/

 

Buy URD O2 simulators: https://www.urdusa.com/product/urd-rear-o2-simulator-1gr-fe-4-0l-v6-dual-channel/
or try something like this:
https://www.ebay.com/i/401164209124

The front cats are weakened a little, and because this is Toyota, it shows those codes very easily.