Re: Code P0455 and the Gas Cap
P0455 is an evap system large leak detected. Could be a broken evap line, cracked cannister, purge valve or vent valve stuck open. Tough to find without an evap smoke machine and a scan tool to seal system.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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