Oxygen (Lambda) Sensor: Look for Pins 28 or 43 to find the heater control and signal lines for the primary O2 sensor [2]. The ME7 and MED9 Era (Drive-by-Wire)
On the sticker, find "HW:" or "Hardware-Nr." The pinout is tied to this, not the car model. bosch motronic ecu pinout
Late 1980s to early 1990s (BMW E30 325i, E34 535i, Porsche 944 S2, early Volvo 940 Turbo). Oxygen (Lambda) Sensor: Look for Pins 28 or
Wiring and testing tips
Bosch Motronic M2.9 ECU Pinout Guide | PDF | Throttle - Scribd Wiring and testing tips Bosch Motronic M2
Having worked on everything from late-80s BMW E30s and Porsche 944s to 90s Audi, Volvo, and even early Ferrari Mondials (yes, they used Motronic too), I’ve come to appreciate—and curse—Motronic pinouts in equal measure. Here’s my detailed, real-world review of what you need to know.