Purge Flow Sensor Circuit Range/Performance
Your car's purge flow sensor, which monitors fuel vapor being cleaned from the charcoal canister, is sending a signal that's out of the expected range or not performing correctly. It's like a fuel vapor traffic cop that's either not seeing the traffic or reporting false numbers.
The ECU monitors voltage signals from the purge flow sensor to verify fuel vapor is flowing from the charcoal canister through the purge control valve into the intake manifold at the expected rate. If the sensor voltage remains static, drifts outside normal operating range, or doesn't respond to purge valve commands, the ECU detects a performance fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage Output | 0.5–4.5 volts (varies with flow rate) | Below 0.1V or above 4.9V for >2 seconds |
| Purge Flow Rate Response | Sensor voltage changes correlate with valve duty cycle | No correlation or response lag >500ms |
Code P0467 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0467 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.