P0468 — Purge Flow Sensor Circuit High Input
Can drive — fix at your convenience.
What P0468 means
This code means the purge flow sensor is sending a signal that's higher than the expected range during EVAP operation. It's commonly caused by a faulty purge flow sensor, an open or shorted-to-power wire, a connector problem, or a purge valve stuck open. The usual repair is replacing the sensor or purge valve and fixing any wiring or connector faults.
Common symptoms
- Check engine light is on
- Car typically drives normally
- Possible rough idle if the purge valve is stuck open
- Faint fuel vapor smell in some cases
- Failed emissions or smog test
Common causes
- Faulty purge flow sensor
- Open circuit or short to power in the sensor wiring
- Corroded or loose sensor connector
- Purge valve stuck open
- 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 P0468 code?
Yes, in most cases it's safe. This EVAP code usually doesn't affect drivability or safety. Still, have it diagnosed within a week or two, particularly before any emissions inspection.
How much does it cost to fix a P0468?
Repairs generally cost between $120 and $400. Replacing the purge valve or flow sensor is the most common fix; wiring or connector repairs can add to the cost.
Is a P0468 code serious?
No, it's low severity. The EVAP system controls fuel vapors and rarely affects how the car drives. The main issues are the check engine light and failing emissions testing.
What's the difference between P0467 and P0468?
Both involve the purge flow sensor circuit. P0467 means the signal is too low, while P0468 means it's too high. They usually share the same root causes, such as a faulty sensor, wiring fault, or stuck purge valve.