P0497
EVAP System Low Purge Flow
Evaporative emissions (EVAP)
Generic OBD-II
Low
What it means
P0497 means the evaporative-emissions (EVAP) system isn't drawing enough fuel-vapor purge flow from the charcoal canister into the engine. The EVAP system captures fuel vapors and burns them during driving; low purge flow usually points to a stuck-closed purge valve or a blocked hose or canister. It's an emissions issue and rarely affects how the car drives.
Low
Can I keep driving? Safe to drive — this is an emissions/fuel-vapor fault. It won't leave you stranded, but it will keep the check-engine light on and can fail an emissions test.
Common symptoms
What you'll notice
- Check-engine light on
- Usually no noticeable driving symptoms
- May fail an emissions/readiness test
- Occasional faint fuel-vapor smell
Common causes
Most likely first
- Purge valve stuck closed or restrictedLikely
- Clogged EVAP canister or blocked purge lineCommon
- Kinked, cracked, or disconnected EVAP hoseCommon
- Faulty fuel-tank (EVAP) pressure sensorLess often
- ECM/PCM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code with a scan tool.
- Command the purge valve and verify it opens and flows.
- Inspect EVAP hoses from the purge valve to the canister for kinks or blockage.
- Check the canister and purge line for restriction; test the fuel-tank pressure sensor.
- Replace the purge valve if it's stuck closed. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0497?+
Yes. It's a low-severity emissions code and won't affect how the car runs. Fix it to clear the light and pass emissions.
Can I just clear P0497?+
It returns until purge flow is restored — usually a stuck purge valve or a blocked hose. Clearing only resets the light.
Related codes
Often seen with P0497
Read & clear P0497 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX