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If your code is a P0455, major leak, then the usual culprit is either a worn out gas cap or a faulty evap purge solenoid. OBDII codes are 5 digits long P=powertrain and the first digit is either "0" which means a generic code or "1" which means a manufacturer specific code and often times there is no definition for those codes and you need to have the code pulled and interpreted with a factory scan tool that will give you a factory code and definition. Case in point is a P0455=ECM4308 in Volvo codes. Hope this helps.
Mark
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