Eng. Fault code PO446 Evap. System need Help.

[IRA51]

I would look at the gas cap first . than if after you replace the gas cap and drive it for 3 or 4 drive cycles if the MIL light won't go out check all evap hose's and the canister .

[HUMTECH]

See above, P0455 is a code that will set with a loose cap, P0446 is an evap restriction. Not trying to be a prick, but each code has its own diagnosis and i do work on these on a daily basis.

[HUMTECH]

DTC P0446

This DTC tests the Evaporative Emission (EVAP) System for a restricted or blocked EVAP vent path. The control module commands the EVAP canister purge solenoid valve Open and the EVAP canister vent solenoid valve Closed. This allows vacuum to be applied to the EVAP system. Once a calibrated vacuum level has been reached, the control module commands the EVAP canister purge solenoid valve Closed and the EVAP canister vent solenoid valve Open. The control module monitors the fuel tank pressure (FTP) sensor for a decrease in vacuum. If the vacuum does not decrease to near 0 inches H2O in a calibrated time, this DTC sets.
The following table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent solenoid valves.
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