Electrical Connectors

Here is an overview of connectors used in the engine harness or aftermarket upgrades.

Feel free to add partnumbers if you find them useful.

BMW M54 MAF Sensor (MS43)

3-pin Junior Mini Timer 2.8mm

Plug: 12521427222 (BMW)

Pin: 12521427612

Cover: 12521707749

Pin 1	M_HFM (Sensor Ground)
Pin 2	A_HFM (MAF Signal Output)
Pin 3	U_HR (+12V Voltage Input)

BMW M54 MAF Sensor (MS45)

Plug: 12527512935 (BMW) (Sealing grommet to go with the plug is part # 61138366245)

Pin: 12527545852

Pin 1	+5V Voltage Input?
Pin 2	+12V Voltage Input?
Pin 3	A_HFM (MAF Signal Output)
Pin 4	Unused
Pin 5	M_HFM (Sensor Ground)
Pin 6	IAT Sensor Output

BMW M54 Throttlebody

Plug: 1J0973713 (VAG) / 12527505669 (BMW)

Socket: 3B0973813 (VAG)

Pin 1	A_DKG1 (Potentiometer 1)
Pin 2	U_DKG (Sensor Supply Voltage +5V)
Pin 3	T_MDK1 (Actuator 1)
Pin 4	A_DKG2 (Potentiometer 2)
Pin 5	T_MDK2 (Actuator 1)
Pin 6	M_DKG (Sensor Ground)

BMW B58 Thottlebody (13548623324)

The B58 throttlebody adapts perfectly with the MS43 and can therefore be used incase anyone wants to use B58 manifold.

Plug: 12527635615 (BMW)

Pins: 61138600419 (BMW)

Pin 1	T_MDK1 (Actuator 1)
Pin 2	T_MDK2 (Actuator 2)
Pin 3	A_DKG1 (Hall Sensor 1)
Pin 4	M_DKG (Sensor Ground)
Pin 5	U_5V_1 (Sensor Supply Voltage +5V)
Pin 6	A_DKG2 (Hall Sensor 2)

BMW B58 TMAP Sensor (13628637900)

Plug: 18302411427 (BMW) (8 509 441-02)

AliExpress: 7549032-02

Pin 1	A_TNDK (Temperature Signal After Throttlebody)
Pin 2	U_5V_2 (Sensor Supply Voltage +5V)
Pin 3	M_PNDK (Sensor Ground)
Pin 4	A_PNDK (Absolute Pressure Signal After Throttlebody)

Audi RS4 MAF Sensor (0280218067)

Plug: 1J0973775A (VAG)

Socket: 1J0973824 (VAG)

Pin 1	IAT Sensor Output
Pin 2	+12V Voltage Input
Pin 3	Common Ground
Pin 4	+5V Input Voltage
Pin 5	MAF Sensor Output