Engine light 2012 mustang

Asked by Blaine Nov 29, 2018 at 08:41 PM about the 2012 Ford Mustang V6 Coupe RWD

Question type: Maintenance & Repair

Keeps throwing code ro replace gascap, this model didnt
come with gas cap. Purchased a gas cap and that didnt fix
it. Ideas?

3 Answers
22,650

Guru9FSV8 answered 5 years ago

Vacuum leak of some sort. Have the evap system smoke tested. If you are mechanical you can make a smoke machine to find your leak. Search YouTube for homemade smoke machine. Pickle jar and some air fittings and hoses. Rag to burn in jar

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22,650

Guru9FSV8 answered 5 years ago

Did you get an OEM gas cap or aftermarket? I have seen so many times that aftermarket caps do not seal. I also recondition the old rubber gasket on cap with silicone paste. You can also buy new rubber gasket and change it out and it is as good as new.

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22,650

Guru9FSV8 answered 5 years ago

You should hear a “swoosh” sound when you take the gas cap off indicating that the system can hold pressure. If you do not hear that then you have a vacuum leak.

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