Description
Impact sensor for cutting off the fuel supply for Citroën and Peugeot vehicles. Inertial – impact switch.
Description
The Inertial Impact Sensor (Fuel Cut-Off Switch) is a safety device designed to immediately interrupt fuel supply in the event of a collision, reducing the risk of fire. This replacement part is commonly searched by its product numbers 636654 and 1477226080 and is compatible with a range of Citroën and Peugeot models. Ideal for professional workshops and experienced DIY mechanics, the unit is a straightforward safety upgrade or replacement that restores correct crash-response behavior.
Function And Symptoms
Function: The sensor monitors sudden deceleration or impact and opens the fuel circuit to stop the fuel pump. Symptoms Of A Faulty Unit: Engine cranks but does not start, fuel pump does not prime, intermittent stalling, or a vehicle that will not restart after a minor collision. Electrical faults or damaged wiring at the connector can also mimic a failed sensor.
How To Replace
Replacement Overview: Disconnect the battery before starting. Locate the inertial switch (refer to vehicle manual for exact location). Unplug the electrical connector and remove the mounting screws or clips. Install the new unit, secure the mounting, reconnect the connector and the battery, then confirm the fuel pump primes and the engine starts. Final checks: Inspect wiring and connector for corrosion and ensure the sensor is firmly mounted and protected from debris and moisture.
Durability And Common Failure Causes
Durability: There is no fixed service interval; the sensor normally lasts many years under normal conditions. Common Failure Causes: Activation during a collision (design function), corrosion or water ingress, physical damage, degraded wiring or connector corrosion, and electrical shorts. Failures are most often linked to accident impact or long-term exposure to moisture and road contaminants.
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
- Other Numbers: N/A
Installation Recommendations
Always Disconnect The Battery Before Removal Or Installation. Ensure The Connector Pins Are Clean And Free Of Corrosion. Mount The Sensor Securely In Its Intended Position To Maintain Proper Trigger Characteristics. After Installation, Verify Fuel Pump Priming And Perform A Short Drive To Confirm Normal Operation. If Wiring Or Connectors Are Damaged, Repair Or Replace Them To Avoid Repeated Failures.
Why This Part Most Commonly Fails
The Inertial Impact Sensor Is Designed To Trigger During An Impact; As A Result, It May Be Found Nonfunctional After Any Collision. Outside Of Collisions, The Most Frequent Causes Of Failure Are Corrosion, Water Ingress, Physical Damage, And Electrical Connector Issues. Regular Inspection Of The Mounting Location And Connectors Helps Prevent Unexpected Faults.
Buy With Confidence
Searchable By Part Number 636654 / 1477226080 — ideal for mechanics and self-repair enthusiasts who prioritize safety and reliable replacement parts. Order now to restore proper fuel-cutoff protection to your Citroën or Peugeot.
