Chip tuning & Stage 1
Software optimisation based on the engine, transmission, software version and vehicle condition.
Citroën · Stuttgart
Citroën: HDi, BSI and emissions diagnostics in Stuttgart.
Citroën uses the same PSA technology as Peugeot, but with its own equipment and comfort configurations. For diagnostics and coding, that means the same tool approach but a different vehicle configuration.
Work on Citroën is part of the documented service scope. The scope is still checked for each vehicle.
Service scope
What MG AutoTech does on Citroën vehicles.
Every service starts in the same order: check the vehicle details, assess the fault, establish technical feasibility, then carry out the work. ECU and TCU access, unlocking, diagnostics and software work are considered separately because they have different requirements.
DPF diagnostics & regeneration
Check filter loading, differential pressure, regeneration history and sensors.
Vehicle diagnostics
Check fault memory, live data and the surrounding systems before making any decision.
Vehicle coding
Code equipment, comfort functions and retrofits according to the vehicle configuration.
Control-unit service
Identification, readout, bench/boot access, backup and programming.
Vehicle assessment
Standard, performance model or already modified?
These three cases can look similar from the outside but differ greatly in technical terms. The assessment determines the work involved, the scope and what is realistically worthwhile.
Standard vehicles
C3, C4 and C5 Aircross, plus Berlingo and Jumper. On vans, fault patterns often relate to conversions and additional electrical equipment.
DS range
Models originating from Citroën’s premium range, with more extensive electronics and more comfort control units. The inspection scope is correspondingly larger.
Previously modified vehicles
Retrofitted electrical equipment is a common fault source on Citroëns. The vehicle-network side is checked before assuming a software cause.
Systems
The control units that matter on Citroën.
The fitted system determines the approach, not the badge. These are the units that feature most often in Citroën enquiries.
Bosch EDC17 (HDi)
The main diesel control-unit family on the PSA platform.
Delphi and Valeo control units
Fitted across several diesel generations, with their own access and reading methods.
BSI and comfort control units
The central electrical-network unit plus model-specific comfort units. Equipment-dependent functions are configured through them.
Engines & transmissions
The Citroën ranges we receive the most enquiries about.
The engine designation alone says little about the outcome. Condition, software version and transmission also matter, which is why a pre-check always comes first.
HDi / BlueHDi (diesel)
Diesel engines with particulate filters, some using additives and others SCR and AdBlue.
PureTech (petrol)
Turbocharged three-cylinder engines with limited headroom. Assessment is deliberately conservative and based on condition.
Typical fault patterns
The issues Citroën vehicles come in with.
These patterns recur. They are a starting point for diagnostics, not a remote diagnosis or a substitute for inspecting the specific vehicle.
Comfort functions fail intermittently
Often a voltage or communication issue around the BSI, less often a failed individual control unit.
Recurring particulate-filter warning
Additive level, differential pressure and interrupted regenerations are assessed together before deciding on cleaning or replacement.
Before we confirm the work
The details needed for a Citroën.
Without these details, any statement about feasibility is a guess. With them, we can usually say before the appointment whether work is possible and within what scope.
- Model, year of manufacture and version
- Engine specification from the registration document
- Whether additional electrics have been fitted (parking heater, towing equipment, conversion)
- Any existing fault codes
- For Berlingo and Jumper: body conversion and use profile
- Vehicle identification number
Further reading
When the work goes beyond the standard configuration.
The working methods are described on dedicated pages. This page focuses on what is specific to the brand.
Performance engineering
Calibration beyond the standard configuration, matched to the hardware and intended use.
Bespoke calibration
Calibration for modified and individually built high-performance vehicles.
Supercar calibration
Software work on high-performance vehicles with a documented starting configuration.
Projects & capability profiles
What each type of project involves technically, and what is supported by evidence.
FAQ
Frequently asked questions about Citroën.
Is Citroën technically identical to Peugeot?
The platform, engines and control-unit families overlap substantially. Equipment configuration and comfort functions are the main differences, and those are decisive for coding.
Several functions on my Berlingo fail at the same time.
That suggests a communication fault in the vehicle network rather than several failed parts. Retrofitted electrical equipment is a common cause and is checked first.
Do you also work on Citroën camper conversions?
Yes, but the conversion is part of the assessment. Payload, additional electrics and use profile change what is sensible; software considered without the conversion does not tell the whole story.
Related brands
Similar technology, similar approach.
Next step
Have technical feasibility assessed for your Citroën.
For a reliable assessment, provide the model, year of manufacture, engine, transmission, existing modifications, fault codes and the aim of the work. You can send photos, logs and vehicle documents directly by WhatsApp or email.