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2010 Ford Fusion SE what does code 420 mean? My check engine light came on and that is the code that Advanced Auto told me to check into.

Vehicle: 2010Ford Fusion 2.4 liter

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You probably mean the P0420 code. P0420 code means that the catalytic convert is not working properly. Follow the link below for more information:

P0420 Ford - Catalyst System Efficiency Below Threshold Bank 1

Read more: https://www.autocodes.com/p0420_ford.html

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