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Catalogue identity
The TuningService.uk ECU catalogue records EDC16CP34 M&S under Bosch EDC16 (catalogue record 1575, 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 EDC16CP34 by its catalogue name for navigation. That placement does not establish hardware or calibration equivalence.
Application evidence
Microtronik’s HexProg II support list names EDC16CP34 M&S for an Audi A8 4.2 TDI quattro DPF example and a Q7 4.2 TDI quattro example. The existing Alientech evidence below uses the more specific EDC16CP34 V8 M&S label. These are supported examples, not an exhaustive fitment or proof that every CP34 uses two controllers.
Tuning and identification
Audi SSP 365 describes the 4.2 V8 TDI as common rail and identifies ECU J623 as master and J624 as slave. It also shows the slave controls charge pressure for both turbochargers and the master communicates engine torque with other systems. Record each ECU’s identity and original read, and consider both controllers’ roles and gearbox torque coordination when assessing a calibration.
Rail-pressure control and injector timing/quantity belong to this common-rail application; do not assume a unit-injector fuel system or copy maps between controllers. Audi also says injector adaptation values must be retained/transferred when an ECU is replaced. Specific calibration maps, coding and programming support must be checked against the installed hardware and software.
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.
Additional source evidence
Alientech uses the more specific label EDC16CP34 V8 M&S for selected Audi A8 D3 4.2 TDI BMC/BVN and Q7 4.2 TDI BTR entries. This is a useful related identification lead; the source does not establish that the catalogue’s shorter EDC16CP34 M&S label has exactly the same scope. Alientech, 2017, PDF pages 26–27.
Identification photograph
This Audi ECU is labelled EDC16CP34, Bosch 0 281 013 013 and Audi 4L0 910 409. Bosch lists the part for the Q7 4.2 TDI; EcuSale describes that application as a master/slave pair using the same part number. The photo shows one unit and does not establish which role it had.
Image source and credit: carsECU.Image source and credit: carsECU; photographer not named by the source. Licence: No reuse licence stated. A source-supplied image is quoted here for identification and discussion; this does not grant a general licence for reuse.
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.Alientech supported-vehicle list, document created 24 March 2017; historical tool coverage; accessed 10 November 2026.Microtronik HexProg II ECU support list. PDF pages 154 and 245, Audi A8/Q7 4.2 TDI EDC16CP34 M&S. Accessed 10 November 2026.Audi Self-Study Programme 365: 4.2 V8 TDI common rail. Pages 27–31: injector adaptation, master/slave ECU roles and torque communication. Accessed 10 November 2026.
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Revision 4: Bosch EDC16CP34 M&S
Catalogue identity
The TuningService.uk ECU catalogue records EDC16CP34 M&S under Bosch EDC16 (catalogue record 1575, 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 EDC16CP34 by its catalogue name for navigation. That placement does not establish hardware or calibration equivalence.
Application evidence
Microtronik’s HexProg II support list names EDC16CP34 M&S for an Audi A8 4.2 TDI quattro DPF example and a Q7 4.2 TDI quattro example. The existing Alientech evidence below uses the more specific EDC16CP34 V8 M&S label. These are supported examples, not an exhaustive fitment or proof that every CP34 uses two controllers.
Tuning and identification
Audi SSP 365 describes the 4.2 V8 TDI as common rail and identifies ECU J623 as master and J624 as slave. It also shows the slave controls charge pressure for both turbochargers and the master communicates engine torque with other systems. Record each ECU’s identity and original read, and consider both controllers’ roles and gearbox torque coordination when assessing a calibration.
Rail-pressure control and injector timing/quantity belong to this common-rail application; do not assume a unit-injector fuel system or copy maps between controllers. Audi also says injector adaptation values must be retained/transferred when an ECU is replaced. Specific calibration maps, coding and programming support must be checked against the installed hardware and software.
Alientech uses the more specific label EDC16CP34 V8 M&S for selected Audi A8 D3 4.2 TDI BMC/BVN and Q7 4.2 TDI BTR entries. This is a useful related identification lead; the source does not establish that the catalogue’s shorter EDC16CP34 M&S label has exactly the same scope. Alientech, 2017, PDF pages 26–27.
Identification photograph
This Audi ECU is labelled EDC16CP34, Bosch 0 281 013 013 and Audi 4L0 910 409. Bosch lists the part for the Q7 4.2 TDI; EcuSale describes that application as a master/slave pair using the same part number. The photo shows one unit and does not establish which role it had.
Image source and credit: carsECU; photographer not named by the source. Licence: No reuse licence stated. A source-supplied image is quoted here for identification and discussion; this does not grant a general licence for reuse.
The TuningService.uk ECU catalogue records EDC16CP34 M&S under Bosch EDC16 (catalogue record 1575, 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 EDC16CP34 by its catalogue name for navigation. That placement does not establish hardware or calibration equivalence.
Application evidence
Microtronik’s HexProg II support list names EDC16CP34 M&S for an Audi A8 4.2 TDI quattro DPF example and a Q7 4.2 TDI quattro example. The existing Alientech evidence below uses the more specific EDC16CP34 V8 M&S label. These are supported examples, not an exhaustive fitment or proof that every CP34 uses two controllers.
Tuning and identification
Audi SSP 365 describes the 4.2 V8 TDI as common rail and identifies ECU J623 as master and J624 as slave. It also shows the slave controls charge pressure for both turbochargers and the master communicates engine torque with other systems. Record each ECU’s identity and original read, and consider both controllers’ roles and gearbox torque coordination when assessing a calibration.
Rail-pressure control and injector timing/quantity belong to this common-rail application; do not assume a unit-injector fuel system or copy maps between controllers. Audi also says injector adaptation values must be retained/transferred when an ECU is replaced. Specific calibration maps, coding and programming support must be checked against the installed hardware and software.
Alientech uses the more specific label EDC16CP34 V8 M&S for selected Audi A8 D3 4.2 TDI BMC/BVN and Q7 4.2 TDI BTR entries. This is a useful related identification lead; the source does not establish that the catalogue’s shorter EDC16CP34 M&S label has exactly the same scope. Alientech, 2017, PDF pages 26–27.
Identification photograph
This Audi ECU is labelled EDC16CP34, Bosch 0 281 013 013 and Audi 4L0 910 409. Bosch lists the part for the Q7 4.2 TDI; EcuSale describes that application as a master/slave pair using the same part number. The photo shows one unit and does not establish which role it had.
