P0496: Evaporative Emission System High Purge Flow

Updated November 12, 2026

The EVAP purge valve should only let fuel vapor into the engine when commanded. P0496 means vapor is flowing when it shouldn't, usually because the purge valve is stuck open.

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🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?

Common causes

Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.

Symptoms

Is it safe to drive?

Usually drivable, but it can cause stalling after refueling.

How to check it with a scanner

  1. Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
  2. With the engine off, put a hand vacuum pump on the purge valve; on most vehicles it should hold vacuum (stay closed) when unpowered.
  3. Use a scan tool to command the purge valve and watch for a change in idle.
  4. Check the wiring to the purge valve.
  5. After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.

A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.

Code readers and scanners in stock

From partner stores' live product feeds. Check that the tool covers your vehicle's make, model and year on the retailer's page before you buy.

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Questions

What does P0496 mean?

P0496 is the generic OBD2 code for "Evaporative Emission System High Purge Flow." The EVAP purge valve should only let fuel vapor into the engine when commanded. P0496 means vapor is flowing when it shouldn't, usually because the purge valve is stuck open.

Is it safe to drive with P0496?

Usually drivable, but it can cause stalling after refueling.

How do I check P0496 myself?

Read the code and freeze-frame data with an OBD2 scanner, then: With the engine off, put a hand vacuum pump on the purge valve; on most vehicles it should hold vacuum (stay closed) when unpowered. Use a scan tool to command the purge valve and watch for a change in idle. Check the wiring to the purge valve.

Related codes

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