Description
Fuel temperature sensor for Citroën and Peugeot vehicles. Suitable for engines with SIEMENS 2.0 HDi injection: RHR, RHK and others.
Product Overview
This high-quality fuel temperature sensor (part number 1579HF) is designed for Citroën and Peugeot applications with Siemens common-rail injection systems. The sensor provides the engine control unit (ECU) with accurate fuel temperature data, allowing the ECU to compensate injection quantity and timing for optimal combustion, economy and emissions. Built for professional workshops and experienced DIY mechanics, this sensor is a direct-fit replacement for many 2.0 HDi installations.
Key Benefits
- Reliable temperature feedback to the ECU for improved fuel metering and cold-start behavior.
- Direct fit for specified Citroën/Peugeot models using Siemens 2.0 HDi (RHR/RHK) injection systems.
- Robust electrical connector and sealing to withstand fuel system environment.
- Easy replacement procedure suitable for trained mechanics and competent DIYers.
Installation Guide
Typical replacement steps for an experienced mechanic or competent DIYer:
- Depressurize the fuel system according to the vehicle manufacturerʼs procedure before disconnecting any fuel lines.
- Disconnect the battery to avoid electrical shorts while working on the fuel system.
- Locate the fuel temperature sensor (commonly mounted on the fuel rail or in a fuel line fitting on HDi systems).
- Disconnect the electrical connector and remove the sensor from its threaded port or housing.
- Replace the sealing O-ring if present and install the new sensor. Hand-start threads and tighten to the manufacturerʼs specification—avoid overtightening.
- Reconnect the electrical connector, reconnect the battery, prime the fuel system and check for leaks and correct engine operation.
Always follow the vehicle manufacturerʼs safety and service instructions. If uncertain about fuel-system depressurization or priming, seek professional assistance.
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: None Specified
Recommended Installation Notes
- Replace the sealing O-ring whenever the sensor is changed to ensure a reliable fuel-tight joint.
- Do not allow dirt or debris to enter the fuel rail or sensor port during replacement.
- After installation, verify no fuel leaks and confirm correct engine running—check for stored fault codes and clear if necessary.
- Use dielectric-safe electrical contact cleaners if connectors are corroded; replace damaged connectors or wiring.
Why This Part Fails Most Often
Common causes of fuel temperature sensor failure include contamination from dirty or water-contaminated fuel, corrosion of the sensor body or connector, mechanical damage during servicing, and electrical faults such as wiring chafing or connector corrosion. Failures typically manifest as incorrect fuel temperature readings to the ECU, triggering drivability issues (rough idle, hard starting), increased fuel consumption or illumination of the engine warning light.
Symptoms Of A Faulty Sensor
- Check engine light with related fuel/temperature fault codes.
- Poor cold-start behavior or extended cranking time.
- Reduced fuel economy or rough running under load.
- Intermittent faults related to connector movement or moisture ingress.
Part number 1579HF is often searched directly by professionals and DIYers—use this reference when sourcing the replacement to increase the chance of correct fitment for Siemens 2.0 HDi RHR/RHK applications.
