Improve cabin comfort and climate control accuracy with this direct-fit interior temperature and humidity sensor from BITRON. Supplied under OEM references 9628358080, 6445JA and 6445AR, the sensor supplies precise cabin temperature and moisture data to the HVAC control unit, helping automatic climate systems, defogging routines and air-recirculation decisions work reliably. Ideal for professional workshops and DIY mechanics searching by part number or vehicle model.

Technical Information

• Manufacturer: BITRON
• Model: Citroën Xsara; Citroën Xsara Picasso
• Product Codes: 9628358080, 6445JA, 6445AR
• Additional Numbers: 6445AR | 6445JA | 9628358080

Function

This sensor measures the interior cabin temperature and relative humidity and sends the data to the vehicle’s climate control module. Accurate readings allow automatic HVAC systems to maintain the set temperature, optimize blower speed, manage air recirculation and assist defogging strategies for improved comfort and visibility.

Fitment And Replacement

Typical location is in the dashboard area near the climate air intake or central console. Replacement is straightforward for trained technicians and competent DIYers with basic tools:

• Disconnect the negative battery terminal before starting work.
• Remove the necessary trim panels to access the sensor location (consult vehicle repair manual for exact access points).
• Unplug the electrical connector and release any retaining clips or screws securing the sensor.
• Install the new sensor, secure it in place, reconnect the connector and refit trim panels.
• Reconnect the battery and verify HVAC operation and sensor response—run automatic climate and defogging checks.

Installation Recommendations

Handle the sensor and connector carefully to avoid damage. Avoid touching the sensing element directly. Use proper trim tools to prevent panel damage. After installation, perform an HVAC diagnostic or at least a full-range climate check (heat/cool, auto mode, recirculation and defog) to confirm correct operation.

Why The Part Fails Most Often

Common causes of failure include moisture ingress or condensation, contamination from dust and debris, connector corrosion, mechanical damage from impact or incorrect removal, and gradual sensor drift with age. Symptoms of a failing sensor are inaccurate cabin temperature readings, erratic HVAC behavior, prolonged interior fogging or poor automatic climate control performance.

Notes For Professionals

This sensor is a direct replacement part referenced by the listed OEM numbers. When diagnosing climate control issues, verify the sensor wiring and connector condition before replacement to avoid repeated failures.