Error code P1401 is displayed and the check engine light is on - what does this mean?
The OBD/EOBD system has detected a fault in the exhaust gas recirculation system (EGR), specifically a defect or malfunction in the EGR valve or its control circuit. This manufacturer-specific DTC P1401 mainly occurs in Ford vehicles and indicates problems with the exhaust gas recirculation system, which is responsible for reducing nitrogen oxide emissions.
What can cause this error code?
- Defective EGR valve
- Blocked EGR ducts or lines
- Damaged vacuum hose system
- Defective EGR position sensor
- Loose or corroded plug connections
- Defective EGR control unit
- Clogged differential pressure sensor
- Damaged wiring harness to the EGR system
What symptoms occur in parallel with fault code P1401?
- Check engine light: Lights up continuously or flashes
- Unsteady idling: Engine runs unevenly at idle speed
- Loss of power: Reduced engine power, especially at low engine speeds
- Increased fuel consumption: Poorer fuel efficiency
- Exhaust problems: Increased NOx emissions during emissions testing
- Starting problems: Difficulties with cold starts
- Knocking noises: Unusual noises from the engine compartment
How can you fix the problem with error code P1401?
- Repairing trouble code P1401 requires a systematic approach to diagnosing and rectifying EGR system problems.
- Clean or replace the EGR valve: Remove the valve, clean it thoroughly with brake cleaner or replace it completely if it is heavily carbonized
- Flush the EGR ducts: Remove soot deposits from blocked exhaust gas recirculation ducts using a special cleaner or compressed air
- Check and replace vacuum hoses: Check all vacuum hoses for cracks, holes or loose connections and replace defective parts
- Replace EGR position sensor: If the sensor is defective, replace it with a new original part and have it calibrated
- Repair electrical connections: Clean plug connections, repair broken cables and treat contacts with contact spray
- Replace differential pressure sensor: Replace clogged or defective pressure sensor and blow through lines
FAQ - Frequently asked questions about DTC P1401
Can I continue driving with error code P1401?
Short distances are possible, but the fault should be rectified as soon as possible. The defective EGR system can lead to increased emissions and engine damage due to overheating.
How much does it cost to repair error code P1401?
The repair costs vary depending on the cause: EGR valve cleaning 80-150 euros, valve replacement 200-400 euros, sensor replacement 150-300 euros. A complete EGR system overhaul can cost 500-800 euros.
Is the code P1401 relevant for the main inspection?
Yes, as fault code P1401 relates to the exhaust gas cleaning system, it leads to a refusal of the general inspection. The vehicle will not pass the emissions test as long as the EOBD error is active.
Can I repair the P1401 myself?
Simple work such as checking the hose or cleaning the EGR valve can be carried out by experienced mechanics. However, more complex repairs to the EGR system should be carried out in a specialist workshop.
How long does it take to repair P1401?
Depending on the cause, the repair takes 1-4 hours. A simple cleaning can be completed in 1-2 hours, while a complete valve replacement with calibration can take up to 4 hours.
Does the error code P1401 return after the repair?
If the repair is carried out correctly and original parts are used, recurrence is unlikely. Regular maintenance and the use of quality fuel prevent EGR problems from recurring.
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