Description
Siemens acceleration sensor for Peugeot 307 vehicles.
The Siemens acceleration sensor 9635739780 (5WK42989 / 8216AL) is a direct-fit replacement for Peugeot 307 applications. This compact accelerometer provides reliable motion feedback to vehicle safety and stability systems. Ideal for professional workshops and DIY mechanics who search by part number, the sensor restores correct input to ABS/ESP and restraint control modules after failure or collision damage.
Technical Information
Manufacturer: Siemens
Model: Peugeot 307
Product Codes: 9635739780
Other Numbers: 5WK42989, 8216AL
Application And Fitment
Fits Peugeot 307 models using the listed OEM references. Always compare the part numbers (9635739780 / 5WK42989 / 8216AL) with the unit being replaced to confirm physical and electrical compatibility before installation.
Function
The acceleration sensor measures vehicle acceleration and deceleration forces and supplies this data to stability control, anti-lock braking and airbag systems. Accurate acceleration input is essential for timely ESP interventions and correct crash detection logic used by restraint control modules.
Common Failure Causes
Typical reasons for sensor failure include electrical faults (open circuits, shorted wiring, corroded connectors), water ingress or contamination, mechanical damage from impacts or accidents, and internal electronic component degradation over time. Symptoms may include ESP/ABS warning lights, inconsistent stability control behavior, or airbag system warnings.
Replacement And Installation Recommendations
Before starting work, disconnect the vehicle battery and follow the manufacturer’s safety procedures. Access usually requires removal of trim or mounting brackets to reach the sensor location; loosen fasteners, unplug the electrical connector and remove the old sensor. Install the replacement unit in the correct orientation, secure fasteners to the manufacturer’s specification, and reconnect the wiring.
After installation the sensor must be calibrated/initialized using a compatible diagnostic tool to ensure precise operation of safety systems. If the vehicle has stability or restraint fault codes, clear and verify them after calibration. Use professional diagnostic equipment where possible to confirm correct sensor output.
Why Replace This Part
Replace the acceleration sensor when fault codes identify sensor malfunction, when the vehicle exhibits unstable braking or stability control behavior, or following collision damage. Installing a correct, matching part number (9635739780 / 5WK42989 / 8216AL) restores proper sensor signals and helps avoid intermittent faults that can disable key safety features.
Tips For Professionals
- Handle the sensor carefully to avoid shock or contamination of the sensing element.
- Ensure connectors and wiring are clean and free of corrosion before reconnection.
- Use the vehicle OEM repair manual for exact removal/installation steps and torque settings.
