I got this code after driving home 400 miles. I checked it and go P0420, i cleared the code and it poped back up a couple days later. It was time to do a smog check, so i cleared the code and took it to the station hoping it will pass good, and it actually passed with amazing results, i attached a picture bellow... however, that code means cats, or co2 sensor, misfire? but smog shows everything perfect, they also check timing there as well, here in Sacramento country, smog regulations are the worst, so you would think it will show any little bug.
Im thinking about running toyota EFI cleaner through the tank, and seafoam with a new oil change, it might not do any good, but if the engine light comes back up again what else should i do, or how can i find out whats exactly that it needs?
Im thinking about running toyota EFI cleaner through the tank, and seafoam with a new oil change, it might not do any good, but if the engine light comes back up again what else should i do, or how can i find out whats exactly that it needs?