MTU 20V 4000 L62 Operating Instructions Manual page 187

Removing NOx sensor (B88)
1. Observe the following general information:
• Arrangement and position of sensor
(→ Page 182).
2. Loosen and disconnect connector (2).
3. Unscrew electronics box (1) at the eyelets.
4. Remove sensor via nut (3).
MS150034/04E 2016-11 | Wiring (General) for Engine/Gearbox/Unit | 187