Product Overview

This ATE inertial sensor (ESP yaw/acceleration sensor) is designed for Citroën and Peugeot vehicles and is commonly referenced by part numbers 9663737780 and 454947. The unit measures vehicle rotation and lateral/longitudinal acceleration and provides critical input to the ABS/ESP stability control system. It is aimed at professional mechanics and experienced DIYers who need a reliable replacement part to restore correct ESP/traction control functionality.

Key Benefits

• Direct replacement for affected Citroën and Peugeot models, matching OEM specifications where applicable.
• Restores accurate vehicle dynamic sensing for ABS/ESP systems.
• Helps eliminate ESP/traction control warning lights and unwanted stability interventions when the sensor is faulty.
• Includes common OE/reference numbers (9663737780, 454947) that customers often search for.

Technical Information

• Manufacturer: ATE (used on Citroën/Peugeot/Stellantis platforms)
• Model: Inertial/Yaw/Acceleration Sensor (ESP)
• Product Codes: 9663737780, 454947
• Additional Numbers: 454947

Compatible Models

Typical fitment includes, but may not be limited to: Citroën C3 III, Citroën C3 Picasso, DS3, Peugeot 207. Always check the part number against the vehicle’s requirements before installation.

Function and Symptoms of Failure

The sensor provides real-time data on yaw rate and lateral/longitudinal acceleration to the vehicle’s ESP/ABS control module. When the sensor fails or drifts out of specification, you may observe one or more of the following:

• ESP/Traction Control warning light on the dashboard.
• Unintended activation or deactivation of stability interventions.
• Loss of precise brake modulation under dynamic conditions.
• Fault codes related to sensor internal errors or communication faults stored in the ABS/ESP control unit.

Why This Part Commonly Fails

Most common causes of failure are:

• Water ingress or long-term moisture exposure leading to internal corrosion or electrical faults.
• Physical damage from impacts or accidents that shift or damage the sensor housing.
• Connector corrosion, wiring damage or poor electrical contact at the connector.
• Aging and sensor drift after many years of service, causing inaccurate readings.

Installation Recommendations

Replacement should be performed by a qualified technician or an experienced DIYer familiar with vehicle safety systems. General steps and recommendations:

• Before starting, always disconnect the vehicle battery and follow the vehicle manufacturer’s safety procedures.
• Locate the sensor (typically mounted near the vehicle centerline—under the center console, under seats or on the vehicle floor depending on model) and remove interior trim to access it.
• Unplug the electrical connector and unbolt the sensor from its bracket. Keep fasteners and note original orientation.
• Fit the new sensor in the exact orientation, torque bolts to the manufacturer’s specification, and reconnect the connector.
• After mechanical installation, a calibration/initialization procedure is usually required using a diagnostic tool (e.g., manufacturer diagnostic equipment). Some vehicles may require a static or dynamic calibration routine to ensure correct sensor alignment and operation.
• Test drive the vehicle and verify that no ESP/ABS warning lights remain and that the stability control behaves normally.

Additional Notes for Professionals

Use proper diagnostic tools to clear stored fault codes and to perform any required sensor calibration or alignment. Typical workshop tools required include basic hand tools, trim removal tools, and an appropriate diagnostic interface capable of ESP system calibration.

Warranty & Quality

Part numbers 9663737780 and 454947 are commonly referenced by technicians and are included in this product description to aid searchability. For long-term reliability, ensure connectors and mounting points are free from corrosion and that the sensor is protected from moisture and mechanical damage during and after installation.