About Citroën
Citroën has always marched to its own beat: cloud-comfy rides, clever family cars like the C4 Picasso and Berlingo, and designs that look like nothing else in the car park. Under the quirky skin it's the same PSA electronics as Peugeot, so a moody BSI, an AdBlue warning or a 'key not detected' message are all part of the charm.
AutoECU looks after Citroën keys, BSI and ECU repairs, coding and diagnostics, from C1s and C3s to Dispatch and Relay vans.
Citroën models & platform codes
UK-market models we commonly work on, with years and the manufacturer's platform / chassis codes. Can't see yours? Ask us, the list isn't exhaustive.
| Model | Years | Code |
|---|---|---|
| C3 / e-C3 | 2024+ | CC21 |
| C3 | 2016-2024 | B618 (SX) |
| C3 | 2009-2016 | A51 (SC) |
| C3 | 2002-2009 | FC |
| C3 Aircross | 2024+ | Mk2 (Smart Car platform) |
| C3 Aircross | 2017-2024 | A88 |
| C4 / e-C4 / C4 X | 2020+ | C41 (C4 X: C43) |
| C4 | 2010-2018 | B7 |
| C4 | 2004-2010 | LC |
| C4 Cactus | 2014-2020 | E3 |
| C5 Aircross | 2025+ | Mk2 (STLA Medium) |
| C5 Aircross | 2018-2025 | C84 |
| C5 X | 2022+ | E43 |
| C5 | 2008-2017 | X7 |
| C5 | 2001-2008 | Mk1 (DC/DE) |
| C4 Picasso / Grand C4 Picasso / SpaceTourer | 2013-2022 | B78 |
| C4 Picasso / Grand C4 Picasso | 2006-2013 | B58 |
| Xsara Picasso | 1999-2010 | N68 |
| C1 | 2014-2022 | Mk2 |
| C1 | 2005-2014 | B0 |
| C2 | 2003-2009 | Mk1 |
| DS3 (Citroën-badged) | 2010-2015 | A55 |
| DS4 (Citroën-badged) | 2011-2015 | B75 |
| DS5 (Citroën-badged) | 2012-2015 | B81 |
| Berlingo | 2018+ | K9 |
| Berlingo | 2008-2018 | B9 |
| Dispatch / SpaceTourer | 2016+ | K0 |
| Dispatch | 2007-2016 | G9 |
| Relay | 2006+ | X250 / X290 |
Popular Citroën coding
- Daytime running lights, auto-lock and mirror fold-on-lock settings
- Apple CarPlay / Android Auto activation on supported NAC and SMEG+ screens
- Reversing camera and rear parking sensor retrofits
- Towbar electrics coding on C5 Aircross, Berlingo and Dispatch
- Cornering lights and follow-me-home lighting
- BSI, ECU and screen replacement coding
- Seatbelt chime and comfort setting tweaks
Common Citroën electronic repairs
- BSI faults: central locking, wipers or lights with a mind of their own, water ingress
- Engine ECU repair and cloning for no-start and no-communication faults
- AdBlue / SCR faults and 'starting impossible' countdown warnings
- Electric parking brake faults on C4 Picasso and Grand C4 Picasso
- Instrument cluster and digital dash faults on C4 Picasso and C3
- Hands-free keyless entry and 'key not detected' problems
- Steering column switch module (COM2000) faults on C2, C3 and Xsara Picasso
Citroën keys & fobs
Transponder key with remote (fixed or flip)
C3 FC, C2, Xsara Picasso, C5 Mk1, Berlingo (early)
Adding keys usually needs the car's 4-digit PIN, which we can normally retrieve.
Remote flip key (HU83 blade)
C3 A51, C4 B7, C4 Picasso B58/B78, DS3, Berlingo B9, Relay
Very common; worn flip mechanisms and buttons can often be repaired.
Hands-free proximity key
C4 Picasso B78, C5 Aircross, C4 C41, C5 X
Keyless entry and start, with an emergency blade inside the fob.
Smart key (latest generation)
C3 CC21, C3 Aircross Mk2, C5 Aircross Mk2, Berlingo K9
Newer cars with secure gateways need dealer-level tools, which we have.
Toyota-built remote key
C1
Same system as the Toyota Aygo and Peugeot 107/108, programmed differently to other Citroëns.
Citroën questions
Can I get a spare Citroën key without going to the dealer?
Yes. Spare and replacement keys for most Citroëns can be cut and programmed on the spot, including all-keys-lost jobs. Contact AutoECU and we'll come to you.
Why is my Citroën showing random warning lights and electrical faults?
On many Citroëns the BSI (body control unit) is the culprit, often thanks to water ingress or a failing connection. AutoECU can diagnose it properly and repair, replace or recode the BSI.
My C4 Picasso's electric handbrake won't release, can you help?
Often it's the parking brake module or motor rather than the brakes themselves. AutoECU can read the fault codes, test the system and get you moving again.
Need something done on your Citroën?
We'll fill in the make for you. Just add your reg and what's wrong.












































