P0497EVAP System Low Purge Flow
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The evaporative emission (EVAP) system stores fuel vapour from the tank in a charcoal canister; a purge valve lets the engine draw it off, and a vent valve opens the canister to fresh air. P0497 is the counterpart of P0496: the module purges but sees too little or no purge flow, judged indirectly from fuel trim, idle control or tank vacuum – CARB requires missing purge flow to be detected. Code-specific use is documented only by Land Rover (5.0-litre V8) and in a GM fault group for systems with a sealed tank (Volt, ELR); standard GM and Ford systems use other codes, such as P0455. The canister is then not purged and saturates.
- What you may notice
- Check engine light on
- Fuel smell around the car
- Fuel nozzle clicks off early
- Likely causes
- LikelyPurge valve stuck closed, does not open
- PossiblePurge line off, kinked or blocked (check valve sticking)
- PossibleCanister or vent filter blocked (e.g. after overfilling)
- RareVent valve stuck closed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.