Description
Fuel pressure sensor 5WS40039 for Citroën and Peugeot 1.4 HDi and 1.6 HDi. High-pressure sensor on the common-rail rail. Used part with a guarantee of functionality.
This high-pressure fuel rail sensor measures rail pressure and provides the engine control unit with accurate data for fuel injection control. It is a direct-fit replacement for vehicles equipped with 1.4 HDi and 1.6 HDi common-rail diesel engines and is often sought under part numbers such as 9653981180 or 5WS40039. Designed for professional workshops and experienced DIYers, the sensor helps restore correct fuel pressure readings, smooth idling and proper engine response when the original unit has failed.
Compatibility And Typical Applications
Suitable for many Citroën and Peugeot models fitted with 1.4 HDi and 1.6 HDi engines. Common vehicle examples include Citroën C3, C4, Berlingo and Peugeot 207, 307, 308, Partner. Always match part numbers listed below with your vehicle’s service documentation before installation.
Installation Recommendation
- Depressurize the fuel system before starting the job to avoid fuel spray and safety hazards.
- Disconnect the negative terminal of the battery to prevent electrical short circuits.
- Remove any engine covers and access the common-rail; unplug the electrical connector from the sensor.
- Unscrew the sensor from the fuel rail carefully—retain or replace the sealing washer. Fit the new sensor by hand first and then tighten to the manufacturer’s specified torque.
- Reconnect the electrical connector and battery, then prime the fuel system and check for leaks. Verify correct operation with a diagnostic tool or by monitoring engine behavior after start-up.
Most Common Failure Causes
The sensor typically fails due to contamination of the fuel (dirty diesel or debris), exposure to water or corrosion at the electrical connector, mechanical damage from vibration or impact, or electrical faults in the wiring harness. Failures are often reported after prolonged service life, fuel system repairs, or when a failing high-pressure pump creates abnormal pressure spikes that damage the sensor.
Technical Information
- Manufacturer: Stellantis (Citroën, Peugeot)
- Model: 1.4 HDi, 1.6 HDi (Common-Rail)
- Product Codes: 9653981180
- Other Numbers: 1920GW, 1570N5, 5WS40039
Buy this fuel pressure sensor to restore reliable rail pressure measurement and stable diesel engine performance. Suitable for professional fitment and competent DIY repairs—keep the fuel system clean and replace sealing washers to maximize service life.
