My check engine light keeps coming on with the same code. P0455 is the code. Had dealer replace several items including the gas cap & a check valve that the dealer assurted me would fix the problem. Any suggestions?
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Re: Check engine Light
The P0455 indicates you have a gross vacuum leak in the EVAP system.
Start at the engine and the vacuum purge valve, start checking the vacuum hoses and lines all the way back to the EVAP canister near the gas tank. Make sure no hose or lines are cracked / disconnected.
If all looks OK, let me know and we will proceed from there. Below is a schematic of the EVAP system for reference.
Good luck and let me know.
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The check engine light won't go out unless you (1) clear the code with a tester or (2) give the computer a chance to determine the problem is no longer there. It has to go thru several test cycles detecting no problem before the computer will turn the light off. You could also have another problem causing an evaporative emission leak (like a vent hose for instance).