Posted on 27 September, 2012
Question about check engine light and p0420 code ?I have an 07 ford ranger 3.0 6 cylinder. I ran the gas down till the gas light came on. I put a quarter tank in. The gas cap was secure to my knowledge. The check engine light came on and a generic diagnostic machine gave me code p0420. So I got several possible explanations about what it meant. But.