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All codes/P0496

P0496

EVAP System High Purge Flow

Moderate severity

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

  • 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.

    high

    Typical part cost: $50-150 part

  • Damaged EVAP Hoses/Lines

    Cracked or disconnected vacuum hoses in the EVAP system can lead to uncontrolled vapor flow.

    medium

    Typical part cost: $0-100 repair

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First things to check

  1. 1Inspect the EVAP purge valve for proper operation (it should be closed when the engine is off).
  2. 2Check all EVAP hoses and vacuum lines for cracks, disconnections, or blockages.

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Tools you may need

Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.

Illustration of a Bluetooth OBD2 adapter, not a product photo

Basic checks

Veepeak OBDCheck BLE

A Bluetooth LE adapter for reading standard engine codes and supported live data.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Regular diagnostics

vgate iCar Pro BLE 4.0

A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Another option

OBDLink CX

A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.

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Illustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.

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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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