Description
Impact sensor for cutting the fuel supply for Citroën and Peugeot vehicles. Slightly damaged rubber part – fully functional. Inertial impact switch.
Product Overview
This inertial impact sensor (crash sensor) is designed to interrupt the fuel supply in the event of a significant deceleration or collision, protecting the vehicle from uncontrolled fuel delivery. The unit is compatible with a range of Citroën and Peugeot models and is commonly searched for under product codes 636654 and 1477226080. The item shows a minor tear on the rubber boot but remains fully functional.
Function And Fitment
The sensor detects rapid deceleration and sends a signal to shut off the fuel pump or fuel supply relay, preventing fuel flow after an impact. It is typically installed in the engine bay or inside the passenger compartment close to the firewall, depending on the model. Proper orientation and secure mounting are important for reliable operation.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën Berlingo; Citroën Xsara; Citroën Xsara Picasso; Peugeot 306; Peugeot 406; Peugeot 607; Peugeot Partner
- Product Codes: 636654, 1477226080
- Additional Numbers: 1477226080, 636654
Installation Recommendations
Recommended procedure for replacement:
- Always disconnect the battery before starting work and wait a few minutes to ensure systems are powered down.
- Locate the sensor according to the vehicle model (engine bay or under-dash area). Refer to vehicle workshop manual for exact location.
- Disconnect the electrical connector carefully to avoid damaging terminals; inspect connector for corrosion or bent pins.
- Remove the mounting fastener(s) and replace the sensor, ensuring the correct orientation and secure mounting.
- Reconnect the connector and battery. If necessary, clear any related fault codes with diagnostic equipment and verify fuel pump operation.
- Use dielectric grease on connector contacts if exposed to moisture to improve long-term reliability.
Why This Part Most Commonly Fails
Common failure causes include water ingress and corrosion of the connector, mechanical damage from previous impacts, or degradation of the rubber boot that allows contaminants inside. Electrical faults may also occur due to wiring damage or corrosion. In this specific unit the rubber part is slightly damaged, which currently does not affect function but can shorten service life if moisture reaches internal components.
Notes For Mechanics And DIYers
Search engines and professional buyers often look up this part by codes 636654 and 1477226080, so including these numbers when listing or ordering helps ensure the correct item. Follow manufacturer procedures and torque specifications when mounting. If fault codes persist after replacement, check wiring and associated relays, and perform diagnostics with appropriate PSA-capable tools if required.
