Dorman 994-478 Vapor Canister

Dorman 994-478 Vapor Canister

Dorman 994-478 is a direct replacement vapor canister for select GM compact cars, built to match the original equipment evaporative emissions canister on covered applications. It restores evaporative system function for 2006-2010 Chevrolet Cobalt, 2007-2010 Pontiac G5, 2006-2007 Saturn Ion, and 2006 Pontiac Pursuit, including models without PZEV California emissions.

Key Features

• OE-style vapor canister replacement for evaporative emissions service
• Carbon filter element for vapor storage and purge system operation
• Plastic housing and plastic connector construction
• Black finish with oval connector shape
• 3-port design with 16 mm port outside diameter and 0.63 in inside diameter
• Bullet terminal type with female connector and male terminals
• Direct-fit replacement for select Chevrolet Cobalt, Pontiac G5, Saturn Ion, and Pontiac Pursuit applications

Detailed Description

This vapor canister is engineered to match the original equipment evap canister used on specific vehicle years, makes, and models. Dorman 994-478 helps restore emissions control by storing fuel vapors in the charcoal media until the purge system draws them into the engine. It is a practical replacement for drivers servicing a Chevrolet Cobalt vapor canister, Pontiac G5 evap canister, Saturn Ion vapor canister, or Pontiac Pursuit evaporative emissions component.

This part cross-references Standard Ignition CP3198 for the same application.

What It Helps Solve

• Evaporative emissions system fault codes related to vapor storage
• Fuel vapor leakage from a damaged or saturated canister
• Check engine light concerns tied to EVAP system performance
• Failed emissions inspection caused by evaporative system issues
• Reduced purge and vent system operation from a worn canister

Installation Notes and Tips

• Verify vehicle fitment by year, make, model, and emissions configuration before installation.
• Inspect EVAP hoses, connectors, and related valves for cracks or blockage during replacement.
• Confirm the 3-port layout and connector style match the original unit before mounting.
• Clear diagnostic trouble codes after repair and verify EVAP system operation with a scan tool if required.

Quality Assurance

Dorman manufactures this vapor canister as an OE-style replacement to restore emissions control on the listed applications. Part number 994-478 is built to match original equipment fit and function for covered vehicles.