What does BMW P155 status mean?

[DeTessa]

Applicable to BMW, it means the engine shutdown timer has timed out. Below is relevant information about the fault code: Reading method: The fault code is displayed by the blinking pattern of the "Check Engine" light on the dashboard. Most electronic control fuel injection systems use this method to display fault codes. When the system enters the fault code reading state, the self-diagnosis system controls the number of blinks and duration of the "Check Engine" light to indicate the fault code. Decoder: The vehicle dashboard will display some basic fault indications, but those are only a small portion. The main method requires the use of a specialized instrument - a decoder. There are many types of decoders, such as X-43KT300, but their working principles and the fault codes they read are the same.