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Discussion Starter · #1 ·
Does anyone know if it matters whether I use the stock gas cap or if it's OK to use another one that I might buy from a PepBoys or AutoZone?

I would like to get a locking cap for the Cougar, but want to make sure it won't trigger the check engine light or cause other problems.

The dealer wants $40 for a 'Ford' locking gas cap.

557 Posts
Get this one if you haven't gotten one yet. I am very happy with mine.

Gas Cap
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