EVAP CANISTER replacement on a 2009 Chevy Cobalt 368,569 mi. (P0441, P0446, P0455, P0456 )

Описание: Several diagnostic trouble codes (DTCs), including P0442, P0449, P0455, and P0456, are related to the evaporative emission control (EVAP) system, including the canister (charcoal canister). These codes indicate various issues within the EVAP system, such as leaks, vent control problems, and purge flow issues.
Here's a breakdown of some common EVAP system DTCs:
P0442: Indicates a small leak in the EVAP system.
P0449: Indicates a problem with the EVAP vent control circuit, often involving the vent valve solenoid.
P0455: Indicates a large leak in the EVAP system.
P0456: Indicates a small leak in the EVAP system, potentially smaller than P0442.
P0446: Indicates a problem with the EVAP vent control circuit, which can be caused by a faulty charcoal canister or other EVAP system components.
P0498 and P0499: Indicate issues with the EVAP vent valve control circuit, specifically a low or high circuit, respectively.
P0441: Indicates incorrect purge flow in the EVAP system.
P0457: Indicates a leak in the EVAP system, specifically when the fuel cap is loose or off.
P0496: Indicates an EVAP flow during a non-purge condition, potentially due to a faulty purge solenoid or fuel pressure sensor.
P0497: Indicates low purge flow in the EVAP system.
Causes and Potential Solutions:
Leaks:
Leaks can be caused by a faulty fuel cap, damaged fuel tank, cracked EVAP hoses, or a leaking charcoal canister.
Vent Valve Issues:
The vent valve might be stuck, malfunctioning, or have a problem with its control circuit.
Purge Valve Issues:
A faulty purge valve or its control circuit can also trigger EVAP-related codes.
Charcoal Canister:
A worn-out or faulty charcoal canister can cause problems with purging and venting.
Fuel Tank Pressure Sensor:
A malfunctioning fuel tank pressure sensor can also lead to EVAP codes.