P0420 - Modern Hemi Forums

Diagnostics & Tuning Powertrain Control Systems | Software | Troubleshooting



Old 12-25-2009, 08:10 PM
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Join Date: Dec 2009
Location: Glendale az
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Default P0420

I have a 2004 dodge ram 1500 with headers high flow cats and a flowmaster true flow intake and a throtle body spacer getting a code p0420 but cats are pretty new anyone else had this problem and able to fix need to get tags for truck wont check it with the light on.
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