Function diagram
| Function diagram | 
| 1. | Check valve, crankcase ventilation | |
| 2. | Air filter | |
| 3. | Unit, mass air flow sensor (686), E39 | |
| 4. | Turbo | |
| 5. | Charge air cooler | |
| 6. | By-pass valve | |
| 7. | Solenoid valve, turbo by-pass (605) | |
| 8. | Throttle body actuator unit (604) | |
| 9. | Intake air temperature sensor (407) | |
| 10. | Manifold absolute pressure sensor (431) | |
| 11. | Engine | |
| 12. | Crankcase ventilation, oil trap | |
| 13. | Check valves | |
| 14. | EVAP canister purge valve (321) | |
| 15. | Evaporative emission canister | |
| 16. | Wastegate valve | |
| 17. | Charge air regulator | |
| 18. | Charge air solenoid valve (179a) | |
| 19. | Oxygen sensor (592, 593) | |
| 20. | Catalytic converter | |
| 21. | Exhaust temperature sensor (602) | |
| 22. | Front silencer | |
| 23. | Rear silencer | |
| 24. | Vacuum pump | |
| 25. | Brake servo | |
| 26. | Check valve | |
| 27. | Fuel pressure regulator | |
| 28. | Atmospheric pressure sensor (539) | |

 
     
		