Add / All Keys Lost – Citroën C4 Picasso 2012 Iamcarhacker

By Juraj · Last updated: April 8, 2026

This guide shows how to program new keys or perform All Keys Lost (AKL) procedure on Citroën C4 Picasso using a diagnostic tool with immobilizer functions.

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Used tool in this guide

Video: How to add key / all keys lost for citroen

This video shows the full process including PIN reading and key learning.

Supported vehicles

Vehicle
c4-picasso-mk1

Technical overview

Item	Details
Vehicle	Citroën C4 Picasso
Year	2012
System	Immobilizer / BSI
Procedure type	Key programming (IMMO)
Difficulty	Medium
Time required	~10–20 minutes
Prerequisites	Stable battery voltage, all keys present

Step-by-step procedure

1. Connect diagnostic tool

Connect tool to OBD2 port
Turn ignition ON (if key available)

2. Select vehicle

Brand: Citroën
Model: C4
Confirm vehicle profile (VIN auto-detected)

3. Enter IMMO function

Go to: IMMO / Key programming
Select: All Keys Lost (guided)

4. Read PIN code

Tool will:
- Connect to BSI module
- Read EEPROM data
- Extract PIN code

⚠️ Notes:

Use USB connection (NOT Bluetooth)
Keep voltage stable (ideally charger connected)

5. Confirm PIN

Tool will display PIN (e.g. Y8UP)
Confirm and continue

6. Start key learning

System will warn:
- All previous keys will be erased
Confirm to proceed

7. Enter number of keys

Input total number of keys you want to program Example: 2

8. Program keys

For each key:

9. Finish procedure

After last key:
- Ignition OFF
- Remove key

10. Remote synchronization (if required)

Follow on-screen instructions:

Insert key → ignition ON
Press LOCK button on remote (10s)
Repeat for additional keys

Additional Information & Compatibility Notes

Uses BSI (Body Control Module) for immobilizer
PIN is read from EEPROM automatically
Some tools require wired connection only
Voltage drop can cause failure during PIN read

Before using or purchasing any diagnostic tool for this procedure, always verify compatibility with your exact vehicle model, year and system configuration. Supported functions may vary depending on software version, hardware revision and regional limitations.

Common issues (real-world)

❌ Bluetooth connection → FAIL (use USB)
❌ Low voltage → BSI error / aborted read
❌ Not all keys present → old keys deleted permanently
❌ Wrong key type → remote learning fails

Alternative tools

Best OBD2 scanners for Key Programming

Related guides & background information

How to program a car key

Legal & safety notice

This procedure modifies vehicle system settings through the control module. Incorrect use may cause faults or warning lights. Always ensure the vehicle is secured and follow proper safety procedures.