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p0420

  1. CODE P0420 after overfilling tank

    4.7L PowerTech V8 Specific Topics
    Hey, new to the forum. Recently purchased 2003 Dodge Ram, 5 speed with the 4.7. 137,000 miles. There were no codes pending or stored prior to purchasing couple of weeks ago, runs strong. 1st, the low fuel light never came on and I assumed I had gas, but it wouldn't start. I put in a gallon...
  2. Catalytic Confusion??

    Performance Mods - Engine - 5.7 Hemi V8
    Hey guys, I have an '04 with a few mods,(K&N CAI, Dal exhaust, and long headers). Recently i bought the Superchips Cortex Tuner and uploaded the 87 octane tune, soon after i got the P0420 code for the Catalytic effiecency Bank 1. i only have 68,000 miles on the truck so i wold be suprised if...
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