Ask a Mechanic Online and Get Answers to Your Car Questions
Hello and Thank you for choosing Just Answer. My name is XXXXX XXXXX I will be the expert assisting you today.
The code P0420 you have is for a catalytic converter efficency below threshold. These means the converter in the exhaust system is not cleaning the gases properly. The converter would need to be replaced. If the vehicle has under 80,000 miles it will be covered under a emmissions 8 year 80,000 mile warranty.