Overview

This Siemens acceleration sensor (G-sensor) is designed for Peugeot 307 first generation models. It measures longitudinal and/or transverse acceleration and supplies the vehicle’s safety and stability control systems with precise motion data. The unit is frequently referenced by product codes 9635739780, 5WK42989 and 8216AL, so customers often search using these numbers.

Key Benefits

• Direct fit for specified Peugeot 307 applications—reduces diagnostic time for mechanics.
• Provides stable, consistent acceleration data for ABS/ESP and other vehicle control modules.
• Ideal for professional workshops and experienced DIY technicians familiar with Peugeot systems.

Technical Information

• Manufacturer: Siemens
• Model: Peugeot 307 First Generation
• Product Codes: 9635739780, 5WK42989, 8216AL
• Other Numbers: NFP (as noted in seller data)

Function And Application

The acceleration sensor converts vehicle acceleration into an electrical signal used by control modules responsible for stability, braking and occupant safety. Typical applications include ABS/ESP signal input and crash/impact sensing logic in restraint systems. Correct operation is essential for reliable stability control and accurate event detection during faults or collisions.

Replacement Procedure

Suitable for both professional mechanics and competent DIYers. General replacement steps:

1. Disconnect the vehicle battery before starting work to avoid electrical damage and accidental airbag deployment.
2. Locate the sensor—commonly mounted near the vehicle center, under the center console, behind trim panels or under the dashboard depending on chassis layout.
3. Remove any trim or fasteners to access the sensor. Unplug the electrical connector and remove mounting fasteners.
4. Install the new sensor in the correct orientation. Reconnect the connector and refit trim panels.
5. Reconnect the battery and perform sensor calibration/zeroing with an appropriate diagnostic tool (DiagBox or a compatible scan tool that supports Peugeot/PSA protocols) if required by the vehicle system.

Installation Recommendations

• Always disconnect the battery before removal and follow the vehicle manufacturer’s safety procedures.
• Handle the sensor carefully—avoid drops and strong impacts that can change internal calibration.
• Ensure connectors and wiring are corrosion-free and securely seated. Clean contact surfaces if necessary.
• Perform post-installation calibration or self-test using a diagnostic tool to clear fault codes and confirm correct sensor output.

Why The Part Most Commonly Fails

Acceleration sensors are generally robust but can fail due to water ingress, connector corrosion, electrical overstress, physical impact from collisions, or damage during previous repairs. Faulty wiring or intermittent connector contact may also produce erratic signals and trigger warning lights or degraded system performance.

Notes For Mechanics

Because this part is often located inside the passenger compartment, pay attention to trim removal to avoid damage. After replacement, verify fault memory in the related control units and run calibration/self-test procedures to ensure the new sensor is correctly read by ABS/ESP or airbag systems.

The Siemens Acceleration Sensor is a direct-fit replacement part designed for the first‑generation Peugeot 307. This sensor provides reliable measurement of vehicle acceleration used by stability control, ABS and other vehicle safety and dynamic systems. Ideal for professional workshops and experienced DIY mechanics, the unit is often looked up by its manufacturer or product codes, making it quick to find in parts catalogues (9648829080, 5WK42989, 8216AL).

Technical Information

• Manufacturer: Siemens
• Model: Peugeot 307 (First Generation)
• Product Codes: 9648829080, 5WK42989, 8216AL
• Additional Numbers: NFP (as referenced by some listings)

Function And Application

The acceleration sensor measures longitudinal and/or lateral acceleration and supplies this data to electronic control units responsible for ABS, ESP/traction control and crash systems. Accurate acceleration input helps these systems make split‑second corrections for vehicle stability, braking and occupant safety.

Replacement And Installation

General replacement steps (for trained technicians):

• Always disconnect the vehicle battery before starting work to avoid short circuits and to protect electronic modules.
• Locate the sensor according to the vehicle’s service manual — on Peugeot 307 models the sensor may be mounted centrally or within the passenger compartment/engine bay depending on the specific system.
• Remove any trim or covers necessary to access the sensor, unplug the electrical connector and remove the mounting fasteners.
• Install the new sensor, tighten fasteners to the manufacturer’s torque specification, reconnect the connector and reassemble trims.
• After replacement clear fault codes and perform any required calibration or adaptation using a suitable diagnostic tool. Some systems require a zero‑point calibration or sensor alignment procedure to restore correct operation.

Installation Recommendations

• Work Should Be Performed By A Qualified Technician Or An Experienced DIY Mechanic Familiar With Vehicle Electronics.
• Use A Diagnostic Tool To Clear Fault Codes And Execute Any Calibration/Initialization Routines Required By The Vehicle.
• Ensure Connector Pins Are Clean And Free Of Corrosion; Use Dielectric Grease If Recommended.
• Follow Manufacturer Torque Specs And Reassembly Procedures To Avoid Sensor Misalignment.

Most Common Cause Of Failure

Acceleration sensors typically fail because of the following reasons:

• Damage From Physical Impact Or Collision — Sensors Can Be Displaced Or Cracked During An Accident.
• Water Ingress Or Corrosion — Moisture And Corrosion At The Connector Or Sensor Body Can Cause Intermittent Faults.
• Electrical Issues — Damaged Wiring, Poor Grounding Or Faulty Connectors Lead To Signal Loss Or Erratic Output.
• Age And Vibration — Over Time Internal Components Can Degrade, Especially In Harsh Operating Conditions.

Notes For Buyers

Search Terms: Siemens Acceleration Sensor, Peugeot 307 Sensor, 9648829080, 5WK42989, 8216AL. This part is intended for first‑generation Peugeot 307 models; verify fitment based on the listed product codes when selecting the correct item for your vehicle.

High-quality Siemens acceleration sensor designed for Peugeot 307 first-generation vehicles. This sensor (part numbers 9649474680, 5WK42989, 8216AL) monitors vehicle longitudinal acceleration and supplies precise motion data to stability, traction and engine management systems. Ideal for professional mechanics and experienced DIY enthusiasts looking to restore correct dynamic control, traction response and diagnostic accuracy after sensor failure or collision repair. Common search terms: Peugeot 307 acceleration sensor, Siemens 5WK42989, 9649474680 sensor, 8216AL accelerometer.

Technical Information

• Manufacturer: Siemens
• Model: Peugeot 307 (First Generation)
• Product Codes: 9649474680 | 5WK42989 | 8216AL
• Additional Numbers: 5WK42989 | 8216AL | 9649474680

Function and Application

This acceleration sensor measures longitudinal (and in some configurations lateral) acceleration of the vehicle and provides real-time data to systems such as ABS, ESP (stability control), traction control and engine management. Correct sensor signal ensures stable vehicle dynamics, accurate traction intervention and proper response of electronic safety systems. The unit is typically used on Peugeot 307 first-generation models and is frequently referenced by its OEM and supplier part numbers when searching or ordering.

Replacement Procedure And Recommendations

• Safety First: Disconnect the negative battery terminal before starting work to avoid electrical damage and unintended airbag or system deployment.
• Access: Remove interior trim panels or center console covers as required to reach the sensor—on many 307s the sensor is mounted on the vehicle body or floor near the center of the vehicle or under the dashboard.
• Removal: Unplug the electrical connector and remove mounting screws or bolts securing the sensor. Inspect the connector and wiring harness for corrosion or damage.
• Installation: Fit the new sensor in the same orientation, secure with original fasteners and reconnect the electrical plug. Follow manufacturer torque recommendations where available.
• Diagnostics and Calibration: After replacement clear fault codes and perform any required initialization or calibration using a suitable diagnostic tool (DiagBox/OBD2 scanner). Systems that rely on acceleration input may require a basic setting or calibration to restore full functionality.
• Post-Installation Check: Verify correct operation by checking for stored fault codes and performing a short test drive to confirm stability and traction control behaviour.

Why This Part Fails Most Often

• Connector Corrosion Or Wiring Damage: Moisture ingress and road corrosion often lead to intermittent signals or open circuits.
• Physical Damage: Impact from collisions or improper handling during previous repairs can damage the sensor housing or internal elements.
• Electrical Faults: Short circuits or voltage spikes in the vehicle electrical system can degrade the sensor electronics.
• Aging And Environmental Stress: Over many years thermal cycling and vibration may affect sensor accuracy and cause drift or failure.

Notes For Professionals

When replacing acceleration sensors, inspect the surrounding mounts and harness and address any corrosion or damage to ensure long-term reliability. Use OEM-equivalent part numbers (9649474680 / 5WK42989 / 8216AL) to obtain correct fitment and performance for Peugeot 307 first-generation vehicles. After installation, perform diagnostic checks and calibrations as required to clear faults and restore accurate vehicle dynamics control.