SOURCE: "Check Engine light"
The issue is that the system randomly checks the loop of the fuel system to confirm that it has no leaks. A missing cap is the easy one to correct. It might also be a slpit in the rubber hose that connects the fuel fill tube (on the chassis) to the one on the tank, or any other hose in the the entire fuel delivery/ fume recovery sysrtem. The solenoid that allows the engine's vacuum to be used to conduct this test can also be sticking so that after the test cycle, it doesn't reclose. Good luck
SOURCE: 2004 chrysler pt cruiser engine light on error
Check the vacuum hoses not even a pin hole,Follow vacuum hose from throttle body to the evap purge solenoid diconnect line at eps can side and hook a hand vacuum pump to eps turn on key don't start add ten inches vacuum no drop in vacuum replace evap purge solenoid if it works it's probally the nvld assembly
SOURCE: What does Chrysler 300 check engine code P0573 mean?
Go here for an explanation:
http://engine-codes.com/p0573_chrysler.html
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engine light came on code p0441
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