If the measured value has again dropped by more than 0.5 bar:

WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.

Replace pressure regulator
NOTE:
- All the fuel hoses and hose clips which were detached within the framework of the checks must be replaced.
- Fault messages may be stored in the fault memory of the DME control unit if the vehicle is operated in the intervening period. The fault messages "Incorrect lambda control" or "Lambda control at stop" must be cleared after the check is completed:
  Interrogate fault memory of DME control unit. Check stored fault messages. Rectify faults. Now clear the fault memory.