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I have a 2013 ST with 37,000+ miles. The other day it started showing CEL. Had it checked at Autozone and it said fault code P0451 Evaporative Emission Control System Pressure Sensor Range/Performance. Autozone's computer didn't offer any solutions, but a guy there said it might be from filling the gas tank too full and to run it for a couple weeks and see if it goes away.

Any ideas?
 

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Chiming in on an old post as I had P0451 come up on my 2018 the other day. Thought it was a canister purge valve issue, as it had appeared before with P1450, which both went away after replacing the CPV. Then P0451 came back on its own and replacing the CPV again didnt clear it. Took it to the dealer and it ended up being a bad fuel tank pressure sensor which is what someone in the RS forum had as well. Hopefully this helps someone at some point.
 
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