PO456......Please help
#1
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Hello. So a couple of month ago I got an engine check, VSC, and TRAC OFF on my Scion xB 2006 so I found out the code (PO456) and started from replacing fuel cap. It worked grate. My check engine, VSC, and TRAC OFF was gone. I had no trouble at all for a bout 4 to 5 month and now, from all of a sudden, I get the same error code (PO456). I tightened the fuel cap but the error code still not going away. Can anyone please recommend me what to do? Why did the error code appeared after 5 month? I'm thinking its not a sensor because if it was it would detect something earlier.