So this code popped up, but hasn’t came back after erasing it.

P0430 popped up on my 2002 sequoia RWD. Sitting at 245k miles. i ended up clearing the code before exiting out of my OBD scanner, and surprisingly the code hasn’t came back after several days of driving, multi hours. Any idea what’s going on here?

 

Probably an o2 sensor that had a little dirt on it

 

Possibly a small exhaust leak?

 

The below pic is from your “Truck is blowing out smoke” thread. What bolts did you end up using ? If Bank 2 downstream nut is loose, it might be cause of exhaust leak as @shifty` mentioned. Check your Nuts Princess !

 

Air cooled VW and Porsche use 8mm x1.25 copper nuts to prevent corrosion

 

Yup, been slowly converting all the exhaust bolts on my old motorcycles to air cooled stainless studs and copper nuts.

 

https://www.youtube.com/watch?v=cjcVJsHF3Cw