Description
Fuel temperature sensor for Citroën and Peugeot vehicles. Suitable for engines with SIEMENS 2.0 HDi injection: RHR, HRJ, RHK and others.
The Fuel Temperature Sensor 1579HF is a direct-fit replacement designed for Citroën and Peugeot diesel applications with SIEMENS 2.0 HDi injection systems. It provides reliable temperature feedback to the engine management, allowing the ECU to adjust fuel metering, injection timing and emission control logic. Ideal for professional workshops and DIY mechanics looking for an OE-style component that reinstates correct fuel temperature readings and prevents drivability issues or emission faults.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model: Citroën C4, Citroën C4 Picasso, Citroën C5, Citroën C5 X7, Citroën C8; Peugeot 307, Peugeot 407, Peugeot 807; Compatible Engines: SIEMENS 2.0 HDi RHR, HRJ, RHK
- Product Codes: 1579HF
- Other Numbers: N/A
Function and Benefits
The sensor measures fuel temperature and supplies this data to the engine control unit. Accurate fuel temperature information is used to optimize injection quantity, ignition strategy and emissions control. A correctly functioning sensor improves cold-start behavior, fuel economy and overall engine response, while preventing false error codes related to the fuel system.
Common Causes of Failure
Failures are usually caused by prolonged exposure to contaminated fuel, corrosion of electrical contacts, wiring harness damage or mechanical stress during service. Thermal cycling and ingress of water or debris into the fuel system can accelerate degradation. Faulty sensors typically trigger ECU fault codes, rough idling, increased fuel consumption or reduced engine performance.
Replacement Guide
- Relieve fuel system pressure according to vehicle service procedures.
- Disconnect the negative battery terminal to prevent electrical shorts while working on the fuel system.
- Locate the fuel temperature sensor (commonly on the fuel rail, fuel filter housing or fuel line depending on model).
- Disconnect the electrical connector and remove any retaining clip or fastener.
- Remove the old sensor and install the new sensor 1579HF, ensuring proper sealing and alignment.
- Reconnect the connector, secure fasteners and re-pressurize the fuel system. Check for leaks.
- Clear any stored fault codes with an OBD diagnostic tool and perform a brief test drive to confirm correct operation.
Installation Recommendations
Use appropriate hand tools and follow manufacturer torque specifications where applicable. Replace any damaged wiring or corroded connectors to ensure reliable electrical contact. After installation, clear ECU codes and verify live fuel temperature readings with diagnostic equipment if available. Always follow safe fuel-handling practices and local regulations.
Notes on Service Life
There is no fixed replacement interval for the fuel temperature sensor; many units last the life of the vehicle. However, if the vehicle has experienced fuel contamination, repeated diesel filter clogging or harsh operating conditions, consider inspection or replacement during fuel system servicing.
