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I had a stant locking gas cap that I put on after noticing my gas level drasticly going down. About a month ago I started getting the gas cap loose error and some P codes. I put on my original cap and the codes still came on. Well after some research I found out it was the purge valve, it was stuck open. Everything's back to normal and I think my heavy foot contributed to the gas level going down.
I have had 2 locking gas caps on my super duty and no problems with codes, Sorry do not know brands, one I bought off Amazon, the other the shop replaced after losing the first one