OBD-II code · Powertrain (generic)
P0497 EVAP System Low Purge Flow
The evaporative emissions system measures purge flow either via a dedicated purge flow sensor or via short-term fuel trim response when the purge valve opens. The flow is significantly lower than expected for the commanded purge rate - typically a clogged purge line, a stuck purge valve, or a leaking vapor canister vent.
Is it safe to drive with P0497?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPurge valve sticking partially closed
- PossiblePurge line restricted by debris or kinks
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.8–2 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Purge Valve, Evap Purge Line, Vapor Canister
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.