Description
Fuel pressure sensor for CITROËN PEUGEOT 1.4 HDi 1.6 HDi. High-pressure sensor on the common rail. Used part with guaranteed functionality.
Product Overview
This high-pressure rail sensor measures fuel pressure on the common-rail injection system of Citroën and Peugeot diesel engines (1.4 HDi / 1.6 HDi). It supplies the engine control unit with an accurate pressure signal to optimise injection timing and quantity, supporting smooth running, reliable starting and correct fuel economy. The unit is suitable for professional workshops and experienced DIY mechanics who replace fuel system sensors and wish to restore correct rail pressure feedback.
Applications
Typical applications include various Citroën and Peugeot models equipped with 1.4 HDi or 1.6 HDi common-rail engines, for example Citroën C2, C3, C4, Berlingo and Peugeot 206, 207, 307, Partner. Always check the part number against the vehicle’s original sensor to ensure correct fitment.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: 1.4 HDi, 1.6 HDi Common-Rail Fuel Pressure Sensor
- Product Codes: 1920GW
- Additional Numbers: 9653981180, 1570N5, 5WS40039
Function
The sensor monitors high pressure inside the common rail and converts it into an electrical signal for the engine control unit (ECU). The ECU uses this information to calculate injection timing, duration and to adapt fuel delivery under varying load and temperature conditions. Accurate rail pressure measurement is essential for emission control and optimal engine performance.
Symptoms Of A Faulty Sensor
Common symptoms include illumination of the engine warning light (MIL), hard or extended cranking, rough idle, reduced power or hesitation under load, increased fuel consumption and intermittent misfires. Fault codes related to rail pressure deviation or sensor circuit faults may be stored in the ECU.
Why The Sensor Fails Most Often
Failures are typically caused by fuel contamination (debris, water or varnish), corrosion or damage to the electrical connector, mechanical damage during servicing, degradation of internal sensing elements over time, or problems elsewhere in the fuel system (clogged filters, failing high-pressure pump) that overstress the sensor. Sealing washer deterioration can also lead to leaks or ingress of contaminants.
Replacement Guide
Basic replacement steps for experienced technicians:
- Relieve fuel system pressure according to manufacturer procedures before disconnecting any fuel lines.
- Isolate the battery to reduce electrical risk.
- Clean the area around the sensor to prevent contamination entering the rail when the sensor is removed.
- Disconnect the electrical connector carefully and unscrew the sensor from the rail using the correct tool.
- Fit a new sealing washer (recommended) and install the replacement sensor. Tighten to the manufacturer’s specification.
- Reconnect the electrical connector and battery, prime the fuel system (turn ignition to ON to operate the lift pump) and check for leaks.
- Clear any stored fault codes with a diagnostic tool and perform a test run to verify correct rail pressure and engine response.
Installation Recommendations
Use a new crush washer or sealing ring on every replacement. Avoid contaminating the rail during the swap—cover open ports if necessary. Inspect the connector and wiring for corrosion or heat damage and replace if needed. If fault codes return after replacement, inspect the fuel filter, high-pressure pump and pressure regulator to eliminate upstream causes. Perform final checks with a diagnostic scanner to confirm proper pressure readings and that no related ECU faults remain.
Condition And Warranty
Used Unit: This is a used part offered with a guarantee of functionality. It has been prepared for fitment but, as with any fuel-system component, correct installation and verification are required to ensure safe and reliable operation.
