Catalogue identity
The TuningService.uk ECU catalogue records EDC16C4 M&S under Bosch EDC16 (catalogue record 1587, observed 10 November 2026). The catalogue name is an identification lead; it does not by itself prove vehicle fitment or software compatibility.
This entry is grouped with EDC16C4 by its catalogue name for navigation. That placement does not establish hardware or calibration equivalence.
Application evidence
AutoChip lists the Audi A8 D3 4.0 TDI quattro 275 PS under EDC16C4 M&S. Audi’s own diagnostic training shows separate master and slave diesel control systems for an A8 2004 4.0 TDI ASE example. Verify the fitted ECU and version rather than treating this as complete fitment.
Tuning and identification
For this documented A8 V8 installation, distinguish and preserve the master and slave identities and original reads; a calibration or definition for one role must not be assumed suitable for the other. Audi’s diagnostic example shows both controllers, while the tuning listing supplies the EDC16C4 M&S designation.
The sources do not establish fixed EDC16C4 map locations or a simple tuning recipe. Check ECU software, gearbox configuration, tool coverage and checksum handling for the actual vehicle.
Read EDC16 torque fuel and tuning basics and EDC16 variant application and tuning differences for the shared context. Examples are not an exhaustive fitment list; check the installed ECU and current tool documentation.
Identification photograph
This Audi ECU is labelled EDC16C4, Bosch 0 281 011 099 and Audi 4E0 907 409 B. A separate file listing groups 0281011099 with 0281011684 as an Audi A8 4.0 TDI master/slave pair. The photograph shows one unit only and does not establish which role it had in a particular vehicle.
ECUFix: A8 4.0 TDI master/slave file listing.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
- TuningService.uk owner ECU catalogue. TuningService.uk master ECU catalogue; administrator access required. Active Bosch EDC16 labels observed on 10 November 2026; this is a dated observation, not a live feed. Source revision Catalogue records and identifiers as observed 2026-11-10; accessed 2026-11-10.
- AutoChip: Audi A8 D3 4.0 TDI. Lists EDC16C4 M&S for the 275 PS application. Accessed 10 November 2026.
- Audi/VW Self-Study Programme 295: vehicle diagnosis. A8 2004 4.0 TDI ASE diagnostic example with separate master and slave diesel systems. Accessed 10 November 2026.