Fault code P1444 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1444 – Purge Flow Sensor Circuit Low Input

P1444: Causes, signs and repairs

Error code P1444 is displayed and the check engine light is on - what does this mean?

The DTC P1444 is recognized by the OBD system if there is a problem with the secondary air system switching valve. This manufacturer-specific error code mainly affects the exhaust gas purification system and occurs particularly in Volkswagen, Audi and other VAG vehicles. The EOBD system registers a malfunction in the secondary air injection area.

What can cause this error code?

Defective secondary air system changeover valve
Damaged vacuum hoses to the changeover valve
Electrical problems in the wiring
Corroded or loose plug connections
Defective secondary air pump
Blocked air lines in the secondary air system
Faulty engine control unit (ECU)
Mechanical blockage of the valve

What symptoms occur in parallel with fault code P1444?

Increased exhaust emissions: The vehicle produces more pollutants than permitted
Loss of power: Noticeable reduction in engine power, especially when starting cold
Uneven idling: Engine runs unevenly at idle speed
Starting problems: Difficulties when starting the engine cold
Exhaust odor: Unusual smell from the exhaust
Check engine light: Permanent illumination of the warning light in the dashboard

How can I fix the problem with error code P1444?

Repairing trouble code P1444 requires a systematic approach to identifying and eliminating the cause.
Replace the changeover valve: Replace the defective secondary air system changeover valve with an original part, including seals and fastening material
Check and replace vacuum hoses: Check all vacuum lines for cracks or leaks and replace damaged hoses completely
Repair electrical connections: Check the wiring to the valve, clean corroded contacts and repair damaged cables
Replace secondary air pump: If the pump is defective, carry out a complete replacement including filter and connection lines
Clean the air lines: Remove blockages in the secondary air lines by professionally cleaning or replacing them
Carry out a control unit update: Have the engine control unit updated to the latest software version and delete the fault memory

FAQ - Frequently asked questions about DTC P1444

Can I continue driving with error code P1444?

Driving is possible in the short term, but you should have the problem rectified as soon as possible. Fault code P1444 can lead to increased exhaust emissions and engine damage.

How much does it cost to repair fault code P1444?

The costs vary between 150-800 euros depending on the cause. A valve replacement costs around 200-400 euros, while a defective secondary air pump can cost 500-800 euros.

How do I recognize a defective changeover valve with code P1444?

Typical signs are hissing noises from the engine compartment, rough idling and increased exhaust emissions. A professional diagnosis confirms the defect.

Can I repair fault code P1444 myself?

Simple work such as replacing vacuum hoses is possible. More complex repairs to the secondary air system should be carried out by specialists.

How often does DTC P1444 occur?

This code is relatively rare and mainly occurs in older VAG vehicles with high mileage. Regular maintenance can reduce the risk.

Does the error code P1444 disappear by itself?

No, the code does not disappear without repairing the underlying cause. The problem must be actively rectified and the fault memory deleted.

Vehicles in which fault code P1444 occurs most frequently

Error code P1444 is a manufacturer-specific DTC that mainly affects the secondary air system and can occur in various vehicle models, but is most common in the following vehicles:

Volkswagen: Golf IV, Passat B5, Bora, Polo (1998-2005)
Audi: A3 8L, A4 B5, A6 C5, TT 8N (1996-2004)
Seat: Leon 1M, Toledo II, Ibiza III (1999-2006)
Skoda: Octavia I, Fabia I, Superb I (1998-2008)

If the code P1444 occurs in your vehicle, you should first have a thorough diagnosis carried out. Many garages offer a free error code readout to help you identify the exact cause. In older vehicles, it may be more economical to overhaul the entire secondary air system instead of replacing individual components. Make sure you only use original parts or high-quality reproduction parts to avoid future problems.

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