03 dodge 1500 O2 sensor
My truck would load up on gas when you sit at an
idel for a little while. Had the check engine light ran
and it thrower code P0420. Changed the upstream
O2 sensor out and it ran great for about 3 days.
Now my light is back on it it's throwing the same
code. Is there something else that could be wrong
to make it read that?