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Changed the fans then the relays fans come on but check engine light is still on

Vehicle: 02 Chevy impala3.4

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Hi there,

It is possible there is a wiring issue since you have already replaced the relays. Here is some more info for you.

P0480 CHEVROLET - Cooling Fan Relay Control Circuit

Read more: https://www.autocodes.com/p0480_chevrolet.html

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