P0496 on Ford
Evaporative Emission System High Purge Flow
P0496 on Ford vehicles indicates evaporative emission system high purge flow. Au7o has documented this code across 3 Ford models — most commonly on F-150, Focus, Transit Connect. P0496 means the evaporative emission (EVAP) system detected high purge flow — fuel vapor is flowing into the engine when it shouldn't, typically because the purge valve is stuck or leaking open. The EVAP system captures fuel vapors in a charcoal canister and meters them into the intake through the purge valve at the correct times; unexpected vapor flow can create a vacuum in the tank and disturb fueling. Symptoms can include rough or stalling idle (especially after refueling), hard starting, or a fuel tank vacuum noise when the cap is removed. Typical repair costs on Ford range from $60 to $450, depending on the specific model and root cause.
Common Causes of P0496
- •Stuck-open or leaking EVAP purge valve/solenoid
- •Faulty purge valve electrical control or wiring
- •Damaged or disconnected purge vacuum hose
- •Faulty vent valve allowing improper flow
- •Failed fuel tank pressure sensor
- •Cracked or pinched EVAP lines
- •Carbon canister saturation or failure
P0496 on Ford by Model
Ford F-150(1 issue)
- EVAP Canister Purge Valve Stuck Open — Hard Start After Refueling, Rough Idle, P0455/P04962011-2020
The EVAP canister purge valve (purge solenoid) on F-150s commonly sticks in the open position, allowing raw fuel vapor from the charcoal canister to be pulled into the intake when it shouldn't be. This floods the cylinders with vapor — owners report a vehicle that cranks but won't start (or stumbles badly) immediately after filling the tank, then runs fine once it clears. A stuck-open or leaking purge valve, along with cracked/collapsed lines between the canister, valve, and intake manifold, is the most common trigger for P0496 (EVAP flow during a non-purge condition) and a frequent cause of P0455/P0442 large/small leak codes. Ford issued TSB 19-2132 covering loose EVAP hose connections on 2018-2019 trucks. The check-engine light is the usual first symptom; drivability impact ranges from none to hard-start/rough-idle. The real OEM purge valve part number is AU5Z-9C915-B (aftermarket cross-refs: Dorman 911-222, Standard CP1-prefix units).
Ford Focus(1 issue)
- Canister Purge Valve Failure Causing Rough Idle and Stalling2012-2018
The 2012-2018 Ford Focus with the 2.0L GDI engine experiences frequent canister purge valve (CPV) failures that cause rough idle, stalling, difficulty starting (especially after refueling), and fuel-related DTCs. The purge valve sticks open, allowing fuel vapors to flood the intake manifold at inappropriate times. This is separate from the carbon buildup issue and is one of the most commonly replaced components on the 2012-2018 Focus. Ford issued TSBs addressing the issue and released updated purge valve designs. The problem affects both manual and automatic (PowerShift) transmission models. Focus Fanatics Forum documents this as one of the top five most-replaced parts on the Mk3 Focus.
Ford Transit Connect(1 issue)
- EVAP Purge Valve Stuck Open (Hard Start After Refueling)2014-2021
Owners report extended cranking, rough idle, or stalling shortly after refueling due to an EVAP canister purge valve that sticks open and floods the intake with fuel vapor. This failure mode is documented across Ford applications and appears in Transit Connect owner reports and service literature addressing purge valve performance. The condition often triggers EVAP-related DTCs and can worsen over time.
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View P0496 across all makes →Frequently Asked Questions
What does P0496 mean on Ford?▼
P0496 stands for "Evaporative Emission System High Purge Flow." P0496 means the evaporative emission (EVAP) system detected high purge flow — fuel vapor is flowing into the engine when it shouldn't, typically because the purge valve is stuck or leaking open. The EVAP system captures fuel vapors in a charcoal canister and meters them into the intake through the purge valve at the correct times; unexpected vapor flow can create a vacuum in the tank and disturb fueling. Symptoms can include rough or stalling idle (especially after refueling), hard starting, or a fuel tank vacuum noise when the cap is removed. On Ford specifically, this code is documented across 3 models.
What causes P0496 on Ford vehicles?▼
Common causes on Ford: Stuck-open or leaking EVAP purge valve/solenoid, Faulty purge valve electrical control or wiring, Damaged or disconnected purge vacuum hose, Faulty vent valve allowing improper flow, Failed fuel tank pressure sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0496 on a Ford?▼
Repair costs on Ford range from $60 to $450, depending on the specific model and root cause.
Which Ford models have P0496 documented?▼
Au7o has documented P0496 on 3 Ford models: F-150, Focus, Transit Connect.