Description
Fuel pressure sensor 5WS40039 for Citroën and Peugeot vehicles with 1.4 HDi and 1.6 HDi engines. High-pressure sensor on the common rail. Used part sold with a functional warranty.
This Fuel Pressure Sensor (common rail high-pressure rail sensor) is a direct-fit replacement frequently searched for by part numbers 5WS40039, 9653981180, 1920GW and 1570N5. Designed for Citroën and Peugeot HDi diesel applications, it monitors rail pressure and provides the engine control unit (ECU) with the data required for correct fuel metering and injection timing. Ideal for professional workshops and experienced DIY mechanics who prefer to identify parts by OEM codes — this listing helps you find the exact sensor quickly and replace a faulty unit to restore drivability and fuel system performance.
Technical Information
- Manufacturer: Stellantis (Citroën, Peugeot)
- Model: 1.4 HDi, 1.6 HDi (Common Rail Diesel Engines) — commonly fitted to a range of Citroën and Peugeot small/compact models
- Product Codes: 5WS40039
- Other Numbers: 9653981180, 1920GW, 1570N5
Installation Recommendations
Work On The High-Pressure Fuel System Requires Care. Before Starting, Relieve Rail Pressure And Isolate The Battery. Basic Replacement Steps:
- Depressurize The Fuel System According To Vehicle Procedure.
- Disconnect The Negative Battery Terminal To Avoid Electrical Faults.
- Clean The Area Around The Sensor To Prevent Contamination Entering The Rail.
- Unplug The Electrical Connector And Remove Any Retaining Clips.
- Unscrew The Sensor From The Common Rail Using The Correct Socket Or Tool.
- Fit A New Sealing Washer/O‑Ring If Supplied Or Recommended, Then Screw In The Replacement Sensor.
- Tighten To The Manufacturer’S Torque Specification And Reconnect The Electrical Connector.
- Reconnect The Battery, Clear Any Stored ECU Fault Codes, Start The Engine And Check For Leaks And Correct Rail Pressure Readings.
If You Are Unsure About Any Step, Have The Replacement Performed By A Qualified Technician. Always Use Correct Seals And Observe Cleanliness Around The Common Rail To Prevent Damage.
Why This Part Fails Most Often
- Contamination: Particles Or Deposits In Fuel Can Damage The Sensor Or Affect Readings.
- Corrosion And Water In Fuel: Water Ingress Or Corroded Connectors Lead To Intermittent Signals Or Failure.
- Electrical Issues: Damaged Wiring, Poor Connectors Or ECU Communication Faults Can Mimic Sensor Failure.
- Mechanical Damage: Overtightening, Impact Or Improper Handling During Service Can Compromise The Sensor.
- Age And Wear: Like All Sensors, Performance Can Drift Over Time Especially On High‑Mileage Vehicles.
Common Symptoms Of A Failing Rail Pressure Sensor Include Illumination Of The Engine Management Light, Hard Starting, Loss Of Power, Poor Idle Quality, Increased Fuel Consumption And Stored Pressure‑related Fault Codes.
Search By Part Number To Ensure Fast Identification: 5WS40039 • 9653981180 • 1920GW • 1570N5. This used unit Is Offered With A Functional Warranty, Making It A Practical Choice For Repairing Common Rail Pressure Faults On Compatible Citroën And Peugeot HDi Engines.
