P0468
EVAP Purge Flow Sensor Circuit High
EVAP / emissions
Generic OBD-II
Low
What it means
P0468 means the EVAP purge flow sensor is reporting a higher-than-normal voltage. This sensor tracks how much fuel vapor is drawn from the charcoal canister into the engine. It's an emissions and vapor-management fault — you may notice a faint fuel smell or a failed emissions test, but the engine still starts and drives normally.
Low
Can I keep driving? Yes — it's an emissions and vapor-management fault; the car drives and starts normally, though expect a failed emissions test until it's repaired.
Common symptoms
What you'll notice
- Check-engine light on
- Failed emissions test
- Possible faint fuel odor
- Occasional rough idle
Common causes
Most likely first
- Faulty EVAP purge flow sensorLikely
- Wiring or connector fault in the sensor circuit (short-to-voltage or open)Common
- Malfunctioning EVAP canister purge solenoidCommon
- Blockage or restriction in the EVAP purge pathLess often
- ECM fault (rare)Less often
How to diagnose & fix
Work through it in order
- Scan freeze-frame data, then inspect the purge flow sensor connector and wiring for shorts, opens, or corrosion.
- Test the purge solenoid operation and check the purge line for blockage or restriction.
- Compare the sensor's signal to spec and replace the sensor if it reads out of range.
- If wiring, solenoid, and sensor all check out, have the ECM evaluated. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0468?+
Yes. This is an emissions and vapor-management code, not a mechanical fault — the engine still starts and drives normally. You'll just fail an emissions test until it's fixed.
Can I just clear P0468?+
It will return once the EVAP monitor runs again unless the sensor or circuit fault is repaired. Check the wiring and connector first.
Related codes
Often seen with P0468
Read & clear P0468 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX