engine

Boost Pressure Sensor

for 2012 Mercedes-Benz S65 AMG 6.0L V12 BiTurbo M275 · RWD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Lexus & Toyota Mechanic · 20+ years

Difficulty

Easy

Time

42 min

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

Replace the boost pressure sensor on the M275 6.0L V12 BiTurbo engine to restore accurate turbocharger boost monitoring and prevent engine performance issues.

Warnings

⚠Allow engine to cool completely before beginning work to avoid burns from hot intake components

⚠Do not disconnect battery as this will cause drivetrain adaptations to reset on this vehicle

ℹ️The M275 engine has two turbochargers; verify which boost sensor is faulty using diagnostic codes before ordering parts

Tools required

10mm socket and ratchetEssential

Torque wrench (10-50 Nm range)Essential

Flat blade screwdriver

Electrical contact cleaner

Clean shop towelsEssential

OBD-II scan toolEssential

Parts

Boost pressure sensor × 1 — A0041531328 or equivalent
Sensor O-ring seal × 1 — Use OEM specification

Preparation

Park vehicle on level surface and engage parking brake
Allow engine to cool for at least 30 minutes
Use scan tool to read and document fault codes to confirm which boost sensor requires replacement
Open hood and secure in raised position
Remove engine cover by lifting upward - it is retained by rubber grommets

Procedure

1
Locate the boost pressure sensor
The boost pressure sensor is mounted on the intake plenum between the turbocharger outlet and throttle body. On the M275 engine, there are typically sensors for each bank. Identify the correct sensor based on your diagnostic code (left bank P0236/P0237/P0238 or right bank P0106/P0107/P0108).
2
Disconnect electrical connector
Press the locking tab on the electrical connector and carefully pull straight back to disconnect from the boost pressure sensor. Do not pull on the wires themselves. Inspect connector pins for corrosion or damage.
3
Remove sensor mounting bolt
Using a 10mm socket, remove the single bolt securing the boost pressure sensor to the intake manifold. Keep the bolt in a safe location for reinstallation.
Torque spec
Sensor Bolts15 Nm (11 lb-ft)
4
Extract old sensor
Carefully twist and pull the boost pressure sensor from its mounting location. The sensor has an O-ring seal that may cause resistance. If stuck, gently rotate while pulling to break the seal. Avoid excessive force that could damage the intake manifold.
5
Inspect mounting bore
Examine the sensor mounting bore in the intake manifold for debris, carbon buildup, or damage. Clean the bore thoroughly with a clean shop towel. Do not allow any debris to fall into the intake system. Check that the mounting surface is smooth and undamaged.
6
Prepare new sensor
Remove the new boost pressure sensor from packaging. Verify it matches the old sensor design. Install the new O-ring seal onto the sensor body, ensuring it seats properly in the groove. Lightly lubricate the O-ring with clean engine oil to ease installation.
7
Install new sensor
Carefully insert the new boost pressure sensor into the mounting bore, ensuring proper alignment. Push firmly until the sensor flange seats flush against the intake manifold surface. Do not cross-thread or force the sensor.
8
Secure sensor with mounting bolt
Insert the mounting bolt and hand-tighten initially to ensure proper thread engagement. Using a torque wrench, tighten the sensor bolt to specification. Do not overtighten as this can crack the sensor housing.
Torque spec
Sensor Bolts15 Nm (11 lb-ft)
9
Reconnect electrical connector
Clean the electrical connector terminals with electrical contact cleaner if needed. Align the connector with the sensor pins and push firmly until you hear and feel the locking tab click into place. Gently tug on the connector to verify it is fully locked.
10
Clear diagnostic codes
Using the OBD-II scan tool, clear all boost pressure related fault codes from the engine control module. This ensures you can verify proper sensor operation after repair.

Reassembly

Reinstall the engine cover by aligning the rubber grommets with the mounting posts and pressing down firmly until seated
Close and secure the hood
Do not start the engine until verification procedure is complete

Verification

Start the engine and allow it to idle for 2-3 minutes while monitoring with scan tool
Verify boost pressure readings are within normal range (approximately 0-5 kPa at idle)
Perform a test drive including moderate acceleration to build boost pressure
Monitor boost pressure readings under load - should reach 100-150 kPa during acceleration depending on throttle position
Re-scan for fault codes after test drive to confirm no boost pressure codes return
Verify check engine light remains off and engine operates smoothly without hesitation

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