P0466 — Purge Flow Sensor Circuit Range/Performance
Can drive — fix at your convenience.
What P0466 means
This code means the purge flow sensor's reading is outside the expected range or doesn't match what the computer expects during EVAP operation. It's commonly caused by a faulty purge flow or purge valve sensor, a stuck purge valve, wiring problems, or vacuum leaks in the EVAP hoses. Repairs usually involve replacing the purge valve or sensor and checking the related hoses and wiring.
Common symptoms
- Check engine light is on
- Car generally drives normally
- Possible faint fuel vapor smell
- Failed emissions or smog test
- Occasional rough idle if the purge valve is stuck
Common causes
- Faulty purge flow sensor or purge valve
- Stuck-open or stuck-closed purge valve
- Vacuum leak in EVAP hoses
- Damaged wiring or connector to the sensor
- Faulty engine control module (rare)
Typical repair cost
$120 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0466 code?
Yes, in most cases. This EVAP code usually doesn't affect drivability or safety, so short-term driving is fine. Just get it checked within a week or two, especially before an emissions test.
How much does it cost to fix a P0466?
Most repairs run between $120 and $400. A new purge valve is the most common fix and is fairly affordable; costs rise if hoses or wiring also need repair.
Is a P0466 code serious?
It's low severity. The EVAP system handles fuel vapors and doesn't usually affect how the car runs. The main concerns are the check engine light and failing emissions testing.
What does the purge flow sensor do?
It monitors how much fuel vapor flows from the EVAP charcoal canister into the engine to be burned. When its readings are out of range, the computer sets P0466 to flag a possible purge system problem.