So this engine code article applies to Nissan, Toyota, Chevrolet, Ford, Honda, GMC, Subaru, VW, etc.P0420 is one of the more common trouble codes that we see. Other popular codes include P0171, P0300, P0455, P0442, etc. So be sure to bookmark this site for future reference!
I have a 2005 Ford Taurus with only 54k miles on it. My check engine light came on and code P0300 came up and I was told I needed new spark plugs and wires. I had those replaced and the car ran terrible so I took it back. They informed me that they had crossed the coil wires...