Thanks a lot, will check fuses and connection, but there is no fault light on dash.I would imagine the fault is as described. You should have a fault light on the dash as well. There is a additive pump that is connected to the BSI and it sounds like there is an issue with the pump's electronic control unit. It may be a case that a fuse has blown in the engine fuse box or there is a connection problem to the pump's ECU. This video should show you where the pump is:You can see electrical connectors at one stage in the video.