2004 Chevy Colorado Code P0496. Fuel tank vapors are allowed to move from the fuel tank due to pressure in the tank through the vapor pipe into the EVAP canister. Vapor Canister Purge Valve The most common culprit with the P0496 trouble code and the Chevy Silverado is going to be the vapor canister purge valve.
Code 420 Catalyst system efficiency below thresholdbank 1 code 496Evaporative emission system-high purge flow. This is especially true right after you fuel up the vehicle. The evaporative emission EVAP control system limits fuel vapors from escaping into the atmosphere.
Its really easy to replace.
EVAP Flow During a Non-Purge Condition. The evaporative emission EVAP control system limits fuel vapors from escaping into the atmosphere. Carbon in the canister absorbs and stores the fuel vapors. The purge valve solenoid tested good and I replaced the vent filter solenoid.
