Description
Product Overview
This External Ambient Temperature Sensor (part number 6445F9) is a direct-fit sensor used on a range of PSA vehicles. It supplies outside air temperature information to the HVAC system and engine control modules to improve climate control logic and certain automatic functions. The sensor is engineered for quick replacement and reliable operation in the front airflow area of the car.
Function And Benefits
- Provides accurate outside temperature readings to the HVAC and ECU for better climate regulation and fuel/engine management.
- Direct-fit design ensures correct electrical connection and mounting for the listed Citroën and Peugeot models.
- Helps restore correct display temperature and prevents incorrect automatic climate responses caused by a faulty sensor.
Typical Applications
Commonly fitted to front bumper or radiator support areas where the sensor is exposed to ambient airflow, protected by a mounting clip or housing behind the grille or lower bumper. Exact mounting location depends on model and year; access is generally from the front under the grille or by removing a small trim panel.
Replacement Guide
Suitable for both professional mechanics and experienced DIYers. Typical replacement steps:
- Park the vehicle on a level surface and switch off ignition.
- Gain access to the sensor by removing the lower grille trim or opening the bonnet and locating the sensor in the front bumper area.
- Disconnect the electrical connector and release the retaining clip or screw.
- Remove the old sensor and install the new sensor in the correct orientation; secure the clip and reconnect the electrical plug.
- Check the temperature display and HVAC operation; clear any stored faults if present using a diagnostic tool.
Typical tools required: flat screwdriver or trim tool, small ratchet or screwdriver set, and basic hand tools. No specialized calibration is normally required for plug-and-play replacements.
Common Failure Modes
- Water ingress or corrosion causing intermittent or incorrect readings.
- Physical damage from impacts or road debris.
- Wiring harness connector corrosion or broken wires leading to open circuit or false readings.
Symptoms of a failing sensor include incorrect outside temperature display, improper automatic climate control behavior, or occasional diagnostic trouble codes related to ambient temperature input.
Technical Information
- Manufacturer: PSA Group / Citroën Peugeot
- Model: Citroën C2, C3, C4, C5, C6, C8, Berlingo, Xsara; Peugeot 206, 207, 307, 407, 807, Partner (and similar PSA models)
- Product Codes: 6445F9
- Additional Numbers: 6445.F9 (alternative notation)
If your vehicle matches the listed models and you are experiencing incorrect ambient temperature readings, replacing the sensor with this direct-fit unit is a straightforward, cost-effective repair to restore correct HVAC and engine behaviour.
