Hey guys,


Over the weekend I had my spark plugs changed and new serpentine belt. Once pulled it was found that my spark plugs were shot. Put new spark plugs in and several hundred miles later my truck threw a couple of codes.

I'm throwing codes P0420/P1000. I cleared the codes to see if it was a fluke and it threw the light on again 144 miles later with 69k on the dial. Could my OB2 sensor be bad? Or could it be caused from my tune? A thought I had was that when Justin tuned my truck my spark plugs may have been going bad so whatever settings he might have tuned it for may have changed due to the spark plugs actually working now. Or the sensor could just be bad. I find it ironic that since I changed the plugs it's now throwing codes.

Anybody have any input on this? How much would the sensor be if I had to replace it?

Thanks