This fuel pressure sensor is a direct-fit replacement for many Citroën and Peugeot HDi common-rail engines. It monitors rail pressure and provides real-time data to the engine control unit (ECU) to regulate injector timing and fuel delivery. Ideal for professional mechanics and experienced DIYers who often search by OE number, this unit is commonly referenced under codes such as 9670076780, 9653981180, 1920GW, 1570N5 and 5WS40039.

Faulty fuel pressure sensors typically cause warning lights, rough idling, loss of power, poor fuel economy, hard starting or intermittent limp-home mode. Replacing a failing sensor restores accurate pressure feedback, improves driveability and prevents incorrect fueling that can affect emission control and turbo response.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: 1.6 HDi, 2.0 HDi
• Product Codes: 9670076780, 9653981180
• Additional Numbers: 1920GW, 1570N5, 5WS40039

Installation Recommendation

Before starting, relieve fuel system pressure and work in a well-ventilated area away from open flames. For safety, disconnect the negative battery terminal. Locate the sensor on the common rail, unplug the electrical connector and remove the retaining fastener(s). Carefully withdraw the sensor and replace the sealing washer or O-ring with a new one to ensure a leak-free fit. Fit the replacement sensor, secure it to the rail, reconnect the electrical connector and restore battery power. After installation, prime the fuel system by cranking the engine or activating the fuel pump, check for leaks and clear any stored fault codes with a diagnostic tool if necessary. Use appropriate hand tools and avoid excessive torque on the sensor body—tighten to the manufacturer’s specification where available.

Why This Part Fails Most Often

Common causes of sensor failure include contamination from fuel (particles or water), corrosion of electrical contacts, vibration and thermal cycling, or internal electronics deterioration. Fuel system issues such as a failing fuel filter, contaminated fuel, or pressure spikes from a faulty high-pressure pump can accelerate wear. Regular maintenance of the fuel system and attention to cleanliness during service helps prolong sensor life.

Parts searched by OE number sell quickly — if you need dependable compatibility with Citroën or Peugeot HDi engines and a used part supplied with a functional guarantee, this fuel pressure sensor is a cost-effective solution for garages and skilled DIY mechanics.

This fuel pressure sensor is designed for PSA Group diesel engines with 1.6 HDi and 2.0 HDi units, commonly found in Citroën and Peugeot models. It monitors the fuel rail pressure and sends real-time data to the engine control unit (ECU) to ensure accurate injection timing and optimal fuel delivery. Replacing a faulty sensor restores reliable engine idling, improves drivability and can reduce fuel consumption and emissions. Technicians and DIY enthusiasts often search for this part by OE numbers such as 9670076780 or 1920GW, so these references are included for quick identification.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: 1.6 HDi, 2.0 HDi (common applications: Citroën C3, C4, C5, Berlingo; Peugeot 207, 307, 308, 407, Partner)
• Product Codes: 9670076780, 1920GW
• Other Numbers: 9670076780 | 1920GW

Installation Recommendations

Before starting work, relieve fuel system pressure and work in a well-ventilated area away from open flames. Typical replacement steps:

• Disconnect the vehicle battery to avoid accidental ECU signals.
• Depressurize the fuel rail following the manufacturer procedure.
• Disconnect the electrical connector from the sensor and remove any retaining bolt(s).
• Carefully extract the sensor from the fuel rail, paying attention to the sealing O-ring. Replace the O-ring if damaged.
• Install the new sensor hand-tight, then torque to the manufacturer specification if available; reconnect the electrical connector and restore battery power.
• After installation, cycle the ignition to allow the fuel pump to prime and check for leaks. Clear any diagnostic trouble codes if present and confirm correct sensor readings with a diagnostic tool or live data.

Common Causes Of Failure

Fuel pressure sensors can fail for several reasons. The most frequent causes are contamination from dirty fuel or clogged fuel filters, exposure to corrosive additives, electrical connector corrosion or broken wiring, and internal sensor degradation after extended service (often appearing around or after 100,000 km depending on operating conditions). Sudden fuel pressure spikes or mechanical damage during servicing can also render the sensor inoperative. Symptoms of a faulty sensor include rough idling, hard starting, poor acceleration, increased fuel consumption and illumination of the engine warning light.

This listing is for a used part offered with a functional warranty. It is a direct replacement for the OE numbers listed above and is suitable for mechanics and experienced DIYers looking to restore proper fuel system control on compatible Citroën and Peugeot diesel engines.