Quali moduli Peugeot 407 sono condivisi con Citroen C5 e C6
The Peugeot 407, Citroen C5 (X7 generation) and Citroen C6 all ride on PSA’s large-car platform from the mid-2000s and share a meaningful number of electronic modules — but the overlap is partial and the differences are real. Fitting a unit from the wrong variant, even one that is physically identical, can result in BSI mismatches, lighting faults or a car that will not start. The guide below maps the sharing accurately so you can make an informed decision before paying for a used part.
Platform Background: What the 407, C5 and C6 Actually Share
Peugeot launched the 407 in 2004 on the PF2 large platform, and the same underpinnings carried the Citroen C5 X7 (2008 onward) and the flagship C6 (2005–2012). All three use a CAN-based electrical architecture with a central BSI (Built-in Systems Interface) as the network hub. The CAN topology, the physical harness routing and many of the module mounting positions are shared. What diverges is the BSI software calibration, the option-specific sub-modules and the instrument cluster configuration, which is tied to the vehicle’s VIN through the BSI.
From a used-parts perspective, the key question is always whether the hardware part number is the same and whether the unit can be recalibrated after fitting. PSA modules generally fall into three categories: plug-and-play after BSI relearn, requiring dealer-level coding, or VIN-locked and non-transferable without factory reset.
Modules That Interchange Freely Across the 407, C5 and C6
ABS and ESP Control Units
The ABS/ESP unit on the 407 and the C5 X7 is frequently a Bosch 8.0 or Bosch 5.7 unit with shared hardware part numbers across both marques. The Citroen C6 uses the same Bosch platform in most configurations. Relevant part numbers include 9660929480 e 9651968080 (Bosch units fitted to 2.0 HDi and 3.0 V6 variants) and the Bosch-side reference 0265950018. When swapping between brands, the unit must be configured through a PSA-compatible tool (Lexia/Diagbox) to adopt the correct vehicle parameters — wheel size, axle load variant and hill-hold status. The hardware is transferable; the calibration is not automatic.
Electric Power Steering Module
407 saloon and estate models fitted with electric power steering use a column-mounted EPS ECU that is shared with certain C5 X7 variants. The hardware reference 9662796480 appears across both nameplates. C6 models, which were available with hydraulic-electric steering, use a different unit. Fitting a 407 EPS ECU into a C5 X7 requires a Diagbox session to write the correct torque map and end-stop calibration — without this, the steering will be either too light or actively resist the driver at lock.
Headlight Control and Xenon Ballasts
Where 407, C5 X7 and C6 are fitted with bi-xenon headlights, the Valeo or Hella ballast units themselves are identical components. The ballast carries no vehicle-specific coding. The adaptive headlight actuator ECU, however, is calibrated to the specific headlight assembly geometry and cannot simply be swapped between a 407 saloon, a 407 coupé and a C6 without recalibration. Part number 9650699180 (Valeo ballast) fits all three models without modification.
Air Conditioning Compressor Control
The AC compressor regulator and the climate control panel are shared hardware where both models are fitted with dual-zone automatic climate. The climate panel itself carries no VIN coding — it is the BSI that holds the climate configuration. Swapping a panel between a 407 and a C5 X7 of the same equipment level works without any additional steps provided the connector pinout matches (it does on like-for-like trim levels).
Modules That Look Shared but Are Not
BSI — Built-in Systems Interface
The BSI is the one module that must never be transferred between vehicles without a full PSA factory-level reinitialisation. Each BSI is married to the vehicle’s VIN, the key transponder data and the instrument cluster mileage. A physically identical BSI from a C5 will not start a 407; the car will crank but the BSI will not authorise fuel injection. Relevant hardware references are 9663861280 e 9663861380, but even matching numbers cannot be swapped without factory reset through Peugeot/Citroen’s server — something only a dealer or a specialist with manufacturer-level access can perform.
Instrument Clusters
The 407 cluster and the C5 X7 cluster use different display designs and different odometer encoding, even where the underlying Magneti Marelli or Jaeger hardware is the same generation. The mileage is stored in both the cluster and the BSI; mismatched pairs will trigger a tamper warning. Fitting a C5 cluster into a 407 is possible mechanically but requires mileage coding and BSI synchronisation through Diagbox. The C6 cluster is a completely different unit (higher-resolution display, different CAN address map) and does not transfer to either model.
Airbag SRS Module
The airbag ECU is calibrated to the specific pyrotechnic loads of each body variant. A 407 saloon unit carries different firing thresholds from a 407 estate or a C6. Even where the hardware part number overlaps (common on early 407 and C5), PSA requires the SRS module to be coded to the exact body type and seat/curtain airbag configuration. Part numbers 9662344180 e 9659568880 appear across multiple variants but must be confirmed against the build data of the receiving vehicle. Never assume two identical part numbers mean identical configuration.
Citroen C6 — Where the Sharing Stops Entirely
The C6 uses the same CAN backbone but diverges more significantly in its body electronics. The C6 hydractive suspension system uses a dedicated Activa ECU that has no equivalent in the 407 or C5. The C6 also uses a MOST optical bus for its audio and navigation system, which the 407 and C5 X7 do not. Any multimedia or MOST-connected module from a C6 is exclusive to that model. The suspension ECU, part reference 9659029780, is C6-only and will not communicate correctly in any other PSA vehicle.
Affected Vehicles and Model Year Notes
- Peugeot 407 saloon, estate and coupé: 2004–2010, all engine variants from 1.8 petrol to 3.0 V6 and 1.6–2.7 HDi diesel
- Citroen C5 X7: 2008–2012, saloon and tourer, overlapping engine range
- Citroen C6: 2005–2012, V6 petrol and 2.7 HDi diesel primarily
- Pre-2008 Citroen C5 (X4 generation, 2001–2008) uses an older architecture and does not share modules with the 407
- ABS module sharing is most reliable between 407 and C5 X7 of matching engine family; diesel ABS calibration differs from petrol on the same hardware
OEM Part Numbers Reference
| Modulo | Part Number | Fits |
|---|---|---|
| ABS/ESP ECU (Bosch 8.0) | 9660929480 | 407, C5 X7 — needs coding |
| ABS/ESP ECU (Bosch 5.7) | 9651968080 | 407 2.0 HDi — needs coding |
| EPS Column ECU | 9662796480 | 407, C5 X7 — needs calibration |
| Xenon Ballast (Valeo) | 9650699180 | 407, C5 X7, C6 — plug-and-play |
| BSI (example ref) | 9663861280 | 407 only — VIN-locked |
| C6 Hydractive ECU | 9659029780 | C6 only — not transferable |
Always cross-reference the exact reference printed on the unit against the vehicle’s build record before ordering. Two units with matching primary part numbers can still carry different software calibrations if the suffix differs.
What to Confirm Before Fitting a Used Unit
For any PSA module sourced from a different vehicle, confirm: (1) the full part number including suffix, not just the base reference; (2) whether the donor vehicle was a saloon, estate or coupé, since body type affects airbag and some body control calibrations; (3) whether the donor engine family matches — diesel ABS calibrations differ from petrol on shared hardware; (4) whether you or your workshop has access to Diagbox for the post-fitting configuration session that most of these units require.
GiantParts supplies tested OEM modules from the 407, C5 and C6 with the full part number visible and confirmed, sourced from documented donor vehicles. This makes the compatibility check straightforward before you commit to a purchase.
FAQ
Can I fit a Citroen C5 ABS module into a Peugeot 407?
The hardware is often identical and the physical swap is straightforward, but the unit must be reconfigured through Diagbox before the car will use it correctly. Without coding, the ABS warning will remain active and the ESP system will not function. A workshop with a PSA-compatible diagnostic tool can complete the configuration in under an hour on most variants.
Will a BSI from a C5 X7 work in a 407 if the part number matches?
No. The BSI is paired to the VIN, the key transponder codes and the instrument cluster at the time of manufacture. Even a physically identical BSI will prevent the engine from starting in a different vehicle until a full factory-level reinitialisation is performed. This requires access to PSA’s centralised server and is not possible with a generic OBD reader.
Are instrument clusters from the 407 and C5 X7 interchangeable?
The hardware generation is similar, but the clusters carry different CAN addresses and mileage encoding. A direct swap will trigger a mileage mismatch warning. The procedure requires Diagbox to synchronise the cluster mileage with the BSI, and in some cases the dealer server is involved. It is technically possible but not a simple plug-and-play operation.
Does the Citroen C6 share anything with the 407 that is genuinely plug-and-play?
Yes — xenon ballast units, certain relay modules and minor body control relays are truly identical and require no coding. The C6 shares more hardware with the 407 at the component level (sensors, actuators) than at the ECU level. Any ECU from the C6 should be treated as model-specific until confirmed otherwise, particularly anything related to the hydractive suspension or the MOST bus.
How do I read the full part number off a PSA module before buying?
PSA part numbers are printed on a label on the module body, typically in the format 9XXXXXXXXX followed by a two-digit suffix. The suffix encodes the software or hardware revision and can indicate compatibility differences between otherwise identical-looking units. Always request the full number including suffix from the seller. A number that ends in 80 and one that ends in 88, for example, may not be interchangeable even if the base digits match.
Find tested OEM electronic parts and modules at:
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