P0466EVAP Purge Flow Sensor Circuit Range/Performance
- 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. A purge flow sensor – a heated thermistor in the purge line between purge valve and intake manifold, as described in a Ford patent – measures purge flow directly for the CARB purge monitor. Today indirect methods (fuel trim, tank vacuum) have largely replaced it; no manufacturer document available to us uses these codes. P0466 means the signal does not fit the purge valve state – the Ford patent judges the voltage difference between 100 % and 0 % purge duty against a calibrated value. The purge flow monitor can then not be evaluated.
- What you may notice
- Check engine light on
- EVAP readiness not set, emission inspection not passed
- No change in driving
- Likely causes
- LikelySensor dirty or sluggish (charcoal dust, fuel deposits)
- PossiblePurge line blocked or purge valve sticking
- RareHose leaking ahead of the sensor
- 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: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.