CEL: P0455 help

Hi everyone,

I picked up an 04 Impala last month and threw a CEL yesterday. Have the 3.4 with almost 123K. Went to auto zone and ran OBDII and code was P0455 (EVAP large leak detection). was wondering what to look for first and was wondering if anyone else had this problem with their impala. thanks.

-R

Could be the gas cap.

checked it and it looked okay.

i found this old thread and will check some of these issues sometime this week.

thanks.

-R