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po440 2002 Chevy Trailblazer

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What is the source of this code and PO 420 on a 2002Chevy Trailblazer?

Vehicle: 2002 Chevy Trailblazer 4.2 liter

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start be tighting the fuel cap and resetting the light. if the gas cap seal is cracking or dry replace with be a OEM gas cap don't use aftermarket

 

https://www.autocodes.com/p0440_chevrolet.html

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