The downstream O2 sensor monitors the catalytic converters, for proper operation. Several things can cause this code, and it could be expensive. Do you have emission testing in the county you live in? If not there could be easier alternatives.
P0446 is for the evap leak, check hoses vac hoses for cracks or splits, the gas cap can also cause this code (there is a pressure relief valve built into the cap). Also if you do not tighten the cap properly, you can set this code.
I had the code P0430 and due to your post, I checked the simple and free checks myself. It was a loose gas cap and now the code has gone away. THANKS THANKS THANKS!!!
Hi Mileage 02 Es300 With Cel
in 92 - 06 Lexus ES250/300/330
Posted
I had the code P0430 and due to your post, I checked the simple and free checks myself. It was a loose gas cap and now the code has gone away. THANKS THANKS THANKS!!!