I have a 2006 Hyundai accent. My check engine light is on it runs fine except idles a lil rough when a.c. is on and my gas mileage isn't great. The code comes up p0420. How do I know if I need a new

Asked by Oct 23, 2013 at 12:58 PM about the 2006 Hyundai Accent GLS Sedan FWD

Question type: Maintenance & Repair

catalytic converter or just o2 sensor.
Please help

1 Answer

285,655

http://www.obd-codes.com/p0420

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