11 00 039 Checking compression of all cylinders (M550i xDrive 2018-2019)

Special tools required: 

• 11 0 222
• 11 8 732
• 11 8 731
• 2 410 242

• Read out DME fault memory.
• Check stored faults
• Rectify faults
• Delete fault memory

Preliminary work: needed: 

• Remove spark plugs. Refer to REMOVING SPARK PLUGS (2018-2019) or REMOVING SPARK PLUGS (2020-2022) .
  NOTE: Illustration shows N74O0 engine

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  Disconnect the plug connection (1) to the injectors on the DME control unit (bank 2, if installed).

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  Unscrew tip (1) from special tool 11 0 222.

  IMPORTANT: Then check the Schrader valve that is now visible for secure seating.

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  Prepare special tool 11 0 222 in conjunction with 11 8 732 and 11 8 731.

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  Screw special tool 11 0 222 into special tool 11 8 731 to 10 Nm.

  IMPORTANT: Oil thread on special tool 11 8 731.

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  Connect special tool 2 410 242 to special tool 11 0 222 with the bayonet closure.

  Screw in the 100-bar sensor (1) on the special tool 2 410 242 hand-tight.

  Connect 100-Bar sensor (1) with the Integrated Measurement Interface Box.

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  Manually screw special tool 11 0 222 into spark plug thread.

  1. Connect vehicle with diagnostic tester.
  2. Select service function "Check compression of all cylinders".
  3. Observe diagnosis instructions.

  Illustration: N74.

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  NOTE: Always connect the IMIB (2) via power cord (1).

  Vehicle with diagnosis

  Connect 100-Bar sensor (1) with the Integrated Measurement Interface Box.

  Observe diagnosis instructions.

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Assemble engine.

Delete the fault memory.