P1444
FordPurge Flow Sensor Circuit Low Input
The purge flow sensor reports information about vapor moving through the EVAP purge system. P1444 means the engine computer detected a sensor-circuit signal that is too low. That points to an electrical signal problem; it does not by itself prove that purge flow is low or that the sensor needs replacement.
⚠️ Before You Begin (Safety First)
Usually this code alone does not make the vehicle unsafe to drive. Stop driving and address the problem promptly if you smell strong fuel vapors, see a fuel leak, or the engine runs so poorly that it is unsafe. Keep sparks and flames away from fuel vapors.
Common Symptoms
- The check-engine light may be on, sometimes with no noticeable change in how the vehicle runs.
- If the faulty signal affects purge control, the engine may idle roughly or run unevenly.
- Fuel-vapor odor or an emissions-test failure may occur, but neither is guaranteed by this code.
- The vehicle may show other EVAP codes if there is a separate purge-system or circuit problem.
Common Causes
- A purge flow sensor fault may produce a signal that is too low.
- Damaged, chafed, or pinched wiring may pull the signal low or disrupt the circuit.
- A loose, damaged, or corroded connector may cause a poor electrical connection.
- A power or ground problem may affect the sensor circuit, depending on vehicle configuration.
- A fault in the engine computer is possible but should be considered only after the sensor and wiring are tested.
Diagnostic Steps
- Record P1444 and any other stored codes and available scan data before clearing anything; related codes can help distinguish a circuit issue from a broader EVAP concern.
- With the vehicle safely parked and the ignition off, visually inspect accessible purge-system wiring and connectors for damage, looseness, or corrosion.
- Check accessible EVAP hoses for disconnection or visible damage, but do not assume a hose problem explains a low electrical input.
- Use vehicle-specific service information before doing electrical tests. If you lack the correct diagram or test equipment, have a technician check the sensor circuit rather than replacing parts by guesswork.
- After a repair, confirm the fault does not return and check for any related codes.
When to Call a Professional
Check the vehicle-specific wiring diagram and scan data before replacing parts. Compare the purge flow sensor reading with purge operation, then inspect the connector and harness and test the circuit's power, ground, and signal as applicable. Consider the sensor itself only after circuit faults are ruled out; investigate the computer only after the rest of the circuit checks out.
Compare component listings
Confirm diagnosis and vehicle fitment before buying. A listing does not prove that a part needs replacement. We may earn a commission from qualifying purchases.
Commonly Asked Questions
Does P1444 prove the purge flow sensor is bad?
No. It identifies a low sensor-circuit input. A wiring, connector, power, or ground issue can cause the same detected condition.
Does this code mean the purge flow is actually too low?
Not necessarily. The code describes the electrical input detected by the engine computer, not a confirmed measurement of actual vapor flow.
Can I keep driving with P1444?
Usually the code alone does not require stopping immediately. Stop if there is a strong fuel-vapor smell, a visible leak, or unsafe engine operation.
Should I replace the sensor first?
No. Inspect the connector and wiring and test the circuit using vehicle-specific information before deciding whether the sensor has failed.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.