P0496
EVAP System High Purge Flow
This code means the engine's computer detected that the Evaporative Emission Control (EVAP) system is purging fuel vapor from the gas tank into the engine at an unexpectedly high rate. This usually happens when the purge valve is stuck open.
EVAP System High Purge Flow
Common causes
- high
Faulty EVAP Purge Valve (Stuck Open)
The purge valve is designed to open and close to control vapor flow; if it's stuck open, it causes excessive flow.
Typical part cost: $50-150 part
- medium
Damaged EVAP Hoses/Lines
Cracked or disconnected vacuum hoses in the EVAP system can lead to uncontrolled vapor flow.
Typical part cost: $0-100 repair
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First things to check
- 1Inspect the EVAP purge valve for proper operation (it should be closed when the engine is off).
- 2Check all EVAP hoses and vacuum lines for cracks, disconnections, or blockages.
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Related codes
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Frequently asked questions
What is the EVAP system?
The EVAP (Evaporative Emission Control) system captures fuel vapors from the gas tank and stores them in a charcoal canister, then purges them into the engine to be burned, preventing them from escaping into the atmosphere.
Why does my car run rough after refueling with a P0496 code?
A stuck-open purge valve can allow too much fuel vapor into the engine, especially after refueling when the tank is full of vapors, causing the engine to run overly rich and stumble.
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