Description
Transponder Antenna For Immobilizer For PEUGEOT And CITROËN Vehicles
This Valeo transponder antenna is a direct-fit immobilizer component designed for Citroën and Peugeot vehicles. Ideal for professional workshops and experienced DIY mechanics, the antenna ring reliably reads the transponder chip in the key to allow engine start. Customers frequently search by part numbers 9634051880, 73656312 and 616071 — include these references when looking for compatibility or replacement parts.
Technical Information
- Manufacturer: Valeo
- Model: Citroën Xsara; Citroën Xsara Picasso
- Product Codes: 9634051880, 73656312, 616071
- Additional Numbers: Stellantis, NFP
What It Does
The transponder antenna (immobilizer antenna ring) senses the radio-frequency signal from the key’s transponder chip when the key is turned in the ignition. It transmits the key ID to the immobilizer control system so the engine control unit will permit fuel injection and ignition. A faulty antenna prevents the vehicle from recognizing the key and commonly results in a no-start condition with an immobilizer warning light on the dash.
How To Replace
Replacement is straightforward for trained technicians and competent DIYers familiar with steering column disassembly. Typical steps:
- Disconnect the battery before any work to avoid short circuits and protect electronic modules.
- Remove steering column trim panels to access the ignition lock and antenna ring.
- Unplug the antenna connector and release any retaining clips or screws holding the ring in place.
- Fit the new antenna ring in the correct orientation around the ignition barrel, secure clips and reconnect the plug.
- Reassemble trims, reconnect the battery and verify key recognition and engine start.
Installation Recommendations
- Always Disconnect The Battery Before Starting Work.
- Inspect Wiring And Connector Pins For Corrosion Or Damage; Clean Or Replace As Needed.
- Ensure The Antenna Is Properly Seated Around The Ignition Barrel To Maintain Reliable Signal Coupling.
- After Installation, Test With All Vehicle Keys To Confirm Consistent Recognition.
- If The Vehicle Still Does Not Recognize The Key, Check Immobilizer Fuses, Wiring, And The Immobilizer Control Unit For Further Diagnosis.
Why This Part Fails Most Often
- Connector Corrosion Or Moisture Ingress Leading To Intermittent Signal Loss.
- Physical Damage During Steering Column Repairs Or Accidents.
- Wiring Abrasion Or Broken Harness Conductors Causing Open Or Short Circuits.
- Faulty Solder Joints Or Internal Coil Degradation Over Time.
- Incorrect Installation Or Misalignment Reducing Signal Coupling With The Key.
This transponder antenna is a cost-effective and commonly replaced item when keys are not recognized or the vehicle exhibits immobilizer faults. Search by part numbers 9634051880, 73656312 or 616071 to find the exact replacement and ensure fast identification for repair jobs.
