Description
Fuel temperature sensor for Citroën and Peugeot vehicles. Suitable for engines with SIEMENS 2.0 HDi injection RHR, HRJ, RHK and others.
Overview
This fuel temperature sensor (part number 1579HF) measures the temperature of the fuel and supplies that information to the engine management system. Proper fuel temperature data help the ECU adjust injection timing and quantity for optimal combustion, emission control and fuel economy. The sensor is compatible with a number of Citroën and Peugeot models equipped with SIEMENS 2.0 HDi injection systems.
Key Benefits
- Direct replacement for affected Citroën and Peugeot diesel engines using SIEMENS 2.0 HDi injection.
- Helps Maintain Efficient Combustion: Accurate temperature readings support correct fueling and reduce smoke and excess consumption.
- Easy To Fit: Designed to match OE mounting and connector interfaces for straightforward installation.
- Ideal For Workshops And DIY Mechanics Searching By Part Number (1579HF).
Symptoms Indicating Replacement
- Engine Management Warning Light Illuminated.
- Poor Cold Start Performance Or Rough Idle.
- Increased Fuel Consumption Or Excessive Smoke From Exhaust.
- Intermittent Engine Hesitation Or Reduced Power Under Load.
Installation Recommendations
Before starting work, relieve fuel system pressure according to the vehicle manufacturer’s procedure and work in a well-ventilated area away from open flames. Clean the area around the sensor to avoid contamination entering the fuel system. Carefully disconnect the electrical connector, remove the old sensor and replace seals or O-rings where applicable. Install the new sensor by hand-threading to avoid cross-threading and then tighten to the manufacturer’s specified torque. After installation, cycle the ignition to check for leaks and verify proper communication with the ECU. Use appropriate personal protective equipment and observe standard safety precautions when handling diesel fuel.
Why The Part Fails
Fuel temperature sensors commonly fail due to contamination (particles or varnish in fuel), water ingress, corrosion of electrical connectors, or thermal cycling over many years. Poor fuel quality or a clogged fuel filter can accelerate sensor degradation. Electrical faults such as damaged wiring or connector corrosion also produce incorrect readings or intermittent failures.
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
- Product Codes: 1579HF
- Other Numbers: Compatible With Engines Using SIEMENS 2.0 HDi Injection – Engine Codes RHR, HRJ, RHK (And Similar Variants)
Maintenance Advice
There is no fixed replacement interval for fuel temperature sensors. Replace on symptom or fault code indication. Regular fuel filter changes and using clean diesel reduce the risk of premature sensor failure. Inspect wiring and connectors during routine service to prevent electrical-related faults.
