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Re: 2004 Grand AM SE1 P0455 Large Leak Code
I haven't had that code before but I've had codes regarding the evap system. I changed solenoids, bought a new gas cap, changed other parts as well. Turned out my wiring harness was hard and brittle from age, causing a loose connection. Bought a new one and never had the code again. I don't know what the part number is for your code issue but it's worth a shot to check that. Let me know if that worked for you, if you go that route.
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