P0467

Universal

Evaporative Emission System Leak Detected (fuel cap loose/off) / Purge Flow Sensor Circuit Low Input

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Low Severity

The code definition covers an evaporative-emissions leak, including a loose or missing fuel cap, and a low electrical input from the purge flow sensor circuit. The EVAP system stores fuel vapors and routes them to the engine to be burned; the sensor circuit reports purge-flow information to the vehicle computer. The code alone does not establish which condition is present or prove that a particular part has failed. The check-engine light may be on, but there may be no noticeable driving symptoms.

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⚠️ Before You Begin (Safety First)

Fuel vapors are flammable. Do not smoke or use open flames near the fuel system, and do not open or disconnect fuel-system components for these checks. If you notice a strong fuel smell, visible fuel leakage, or feel unwell from fumes, stop driving in a safe place and arrange professional help.

Common Symptoms

  • The check-engine light may be on because the vehicle has detected an EVAP leak or a low purge flow sensor circuit input.
  • There may be no noticeable symptoms; EVAP and sensor-circuit faults can be detected without changing how the vehicle drives.
  • A fuel-vapor odor may occur if an EVAP leak is present, but the code does not confirm that a leak is the cause.
  • If purge-system operation is affected, some vehicles may have drivability changes, but these are not established by this code alone.
  • The vehicle may fail an emissions inspection where EVAP faults are checked.

Common Causes

  • The fuel cap may be loose, missing, damaged, or not sealing correctly.
  • An EVAP hose, connection, or other system component may have a leak.
  • The purge flow sensor circuit may have a wiring or connector problem that results in a low input.
  • The purge flow sensor itself may be faulty, but testing is needed before condemning it.
  • A related power, ground, or control-circuit issue may affect the sensor signal.

Diagnostic Steps

  1. Check that the fuel cap is present and seated securely; inspect it for obvious damage. This is a simple check for one of the conditions named in the code definition.
  2. With the vehicle off and cool, visually inspect accessible EVAP hoses and connectors for disconnection, cracking, or obvious damage. Do not disconnect fuel-system parts.
  3. If you have a scan tool, record the code and any related codes before clearing anything. Related information can help distinguish an EVAP leak from a circuit fault.
  4. If the code returns or the cause is not apparent, have the EVAP system and sensor circuit tested using service information specific to the vehicle.

When to Call a Professional

A technician can review all stored codes and available scan data, check the cap and EVAP system for leaks, and test the purge flow sensor circuit and its wiring using the vehicle-specific service information. A smoke test or electrical diagnosis may help distinguish an EVAP leak from a low circuit input. The code should be diagnosed before replacing parts.

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Commonly Asked Questions

Does P0467 prove that the fuel cap is loose?

No. A loose or missing cap is named as one possibility, but the definition also includes an EVAP leak and a low purge flow sensor circuit input. Inspection and diagnosis are needed to identify the condition.

Does a low sensor-circuit input mean purge flow is actually low?

Not necessarily. It describes a low electrical input in the purge flow sensor circuit; a wiring, connection, sensor, or related circuit issue can affect the signal. Testing is needed to determine whether actual flow is also affected.

Can I drive with this code?

If the vehicle runs normally and there is no strong fuel odor or visible leak, the code alone does not necessarily mean you must stop immediately. Arrange diagnosis, and stop safely and seek help if you detect strong fuel fumes or leakage.

Should I replace the purge flow sensor?

Not based on the code alone. A technician should first check for an EVAP leak and test the sensor circuit and connections; the exact procedure depends on the vehicle.

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