Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Air Intake Systems
There are different air intake system designs. Depending on the motorization, the corresponding sensors must follow certain designations so that they match up with the fault memory entries. The measuring procedure of the sensors also determines the designation.
This document is intended as an aid to illustrate the designations.
Engine B36A15, B38A12, B38A15, B38B15, B46A20, B48A20:
| Item | Explanation |
|---|---|
| 1 | Exhaust turbocharger |
| 2 | Charge air cooler |
| 3 | Throttle valve |
| 4 | Intake cylinder |
| 5 | Intake pipe pressure sensor |
| 6 | Charge air temperature charging pressure sensor |
Engine N63TU2, S63TU4:
| Item | Explanation |
|---|---|
| 1 | Exhaust turbocharger |
| 2 | Charge air cooler |
| 3 | Throttle valve |
| 4 | Intake cylinder |
| 5 | Intake pipe pressure sensor charge air temperature |
| 6 | Charging pressure sensor |
B38 (I12), B48 and B58 (installed longitudinally):
| Item | Explanation |
|---|---|
| 1 | Exhaust turbocharger |
| 2 | Throttle valve |
| 3 | Charge air cooler |
| 4 | Intake cylinder |
| 5 | Intake pipe pressure sensor charge air temperature |
| 6 | Intake air temperature sensor |
| 7 | Charging pressure sensor |
Engine N74TU, N74TU2:
| Item | Explanation |
|---|---|
| 1 | Exhaust turbocharger |
| 2 | Throttle valve |
| 3 | Charge air cooler |
| 4 | Intake cylinder |
| 5 | Intake pipe pressure sensor charge air temperature |
| 6 | Intake air temperature charging pressure sensor |
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NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.