Hello
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Hello
Hey everyone! I have an '06 3/4 ton Quadcab with a 5.7 Hemi with just over 100,000 mile. My check engine light came on and the code I got from my Hypertech programmer is P0420, any suggestions on whether I can fix it or take it to a shop. I'm also needing suggestions on improving the mileage, it's getting about 10 mpg now at 60 mph and less. Thanks for the help in advance!
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Joined: Apr 2010
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From: Clayton MI
P0420 1/1 Catalytic Conv Eff
Its whining about cat efficiency. Means either your O2 sensors are going bad, or the cat is. Given that you are getting crappy gas mileage, I would start by replacing the pre-cat O2 sensor on the drivers side.
Its whining about cat efficiency. Means either your O2 sensors are going bad, or the cat is. Given that you are getting crappy gas mileage, I would start by replacing the pre-cat O2 sensor on the drivers side.
