2D25 Mass Air Flow Excessive - External tuning box detected

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This topic applies to

  • MSD81 engine control module


2D25 is stored in the MSD81 control module when an external tuning box is detected. These external tuning systems work by manipulating the control signals to and from the engine control module. When this fault is detected by BMW dealers' diagnostic tools, this information is sent to BMW. Some customers have received letters from BMW stating that their warranty has been voided from the use of an external tuning device.

This fault code can be cleared just like any other fault code.

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