Manifold Absolute Pressure Sensor

Replace the Manifold Absolute Pressure (MAP) sensor on the M275 6.0L V12 BiTurbo engine to restore proper boost control and engine performance monitoring.

Warnings

Tools required

Parts

• MAP Sensor × 1 — A0061539028 or equivalent OEM
• MAP Sensor O-ring seal × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level surface and engage parking brake
3. Open hood and secure with prop rod
4. Disconnect negative battery terminal and wait 5 minutes for system discharge
5. Locate MAP sensor on intake plenum - typically mounted on left bank intake manifold near firewall
6. Clear any stored fault codes with diagnostic tool if available

Procedure

1. 1

   Remove engine cover
   Remove the decorative V12 BiTurbo engine cover by pulling upward firmly on the front and rear sections. The cover is secured by rubber grommets on mounting posts. Set cover aside in a clean area.
2. 2

   Access MAP sensor location
   Identify the MAP sensor mounted on the intake manifold or plenum. On most M275 engines, it is located on the left cylinder bank near the firewall. Remove any plastic covers or heat shields blocking access using T25 Torx driver if necessary. Some models may have additional acoustic covers that require removal.
   Torque spec

   Cover Bolts22 Nm (16 lb-ft)
3. 3

   Disconnect electrical connector
   Press the release tab on the MAP sensor electrical connector and carefully pull the connector straight off the sensor. Do not pull on the wiring harness. Inspect connector pins for corrosion or damage. If connector is stubborn, use a small flat blade screwdriver to carefully release the locking tab.
4. 4

   Remove vacuum hose connection
   If equipped with a vacuum hose connection, carefully disconnect the vacuum hose from the MAP sensor by gently twisting while pulling. Note the orientation and routing of the hose for reinstallation. On direct-mounted sensors integrated into the intake manifold, this step may not apply.
5. 5

   Remove MAP sensor mounting screws
   Using the T25 Torx driver or appropriate tool, carefully remove the MAP sensor mounting screws. Typically there are 2 screws securing the sensor to the manifold. Keep screws in a safe location for reinstallation. Gently wiggle the sensor to break the seal if stuck.
6. 6

   Extract MAP sensor
   Carefully pull the MAP sensor straight out from the mounting location. Avoid twisting or applying excessive force. If the sensor is seized, gently rock it back and forth while pulling. Remove and discard the old O-ring seal from the sensor port.
7. 7

   Clean mounting surface
   Clean the MAP sensor mounting area on the intake manifold thoroughly using shop towels. Remove any debris, old O-ring material, or carbon deposits from the sensor port. Spray electrical contact cleaner into the port if necessary and allow to dry completely. Inspect the port opening for cracks or damage.
8. 8

   Install new O-ring seal
   Install the new O-ring seal onto the new MAP sensor, ensuring it is seated properly in the groove. Lightly lubricate the O-ring with clean engine oil if needed to ease installation. Verify the O-ring is not twisted or damaged.
9. 9

   Install new MAP sensor
   Carefully insert the new MAP sensor straight into the mounting port, ensuring proper alignment. Push firmly until the sensor seats completely against the mounting surface. Do not force or cross-thread the sensor.
10. 10

    Secure MAP sensor
    Install the MAP sensor mounting screws and tighten by hand until snug. Using a torque wrench, tighten the screws to specification in a cross-pattern if multiple screws are present. Work carefully to avoid stripping the threads or cracking the sensor body.
    Torque spec

    MAP Sensor Screws3 Nm (2 lb-ft)
11. 11

    Reconnect electrical and vacuum connections
    Reconnect the electrical connector to the MAP sensor, pressing firmly until you hear or feel a positive click. Tug gently on the connector to verify it is locked in place. Reconnect the vacuum hose if applicable, ensuring it is fully seated and routed correctly.
12. 12

    Reinstall covers and components
    Reinstall any heat shields, acoustic covers, or plastic covers that were removed for access. Torque all cover bolts to specification. Ensure no tools or shop towels are left in the engine bay.
    Torque spec

    Cover Bolts22 Nm (16 lb-ft)

Reassembly

1. Reinstall the V12 BiTurbo engine cover by aligning the grommets with the mounting posts and pressing down firmly
2. Reconnect the negative battery terminal and torque to 10 Nm
3. Verify all electrical connections are secure and all covers are properly installed

Verification

• Start the engine and allow it to idle; verify no rough running or hesitation occurs
• Check for vacuum leaks around the MAP sensor by listening for hissing sounds
• Use diagnostic scan tool to verify MAP sensor is reading properly (typical idle reading: 35-45 kPa at sea level)
• Clear any stored diagnostic trouble codes and perform a test drive
• Monitor for any return of fault codes P0105-P0109 (MAP sensor circuit issues)
• Verify boost control is functioning properly under acceleration with no limp mode activation

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