Hi Colin

This is from the Ross-Tech Wiki:-

16575/P0191/000401 - Fuel Pressure Sensor (G247): Implausible Signal
Possible Symptoms

* Malfunction Indicator Light (MIL) ON

Possible Causes

* High/Low Fuel Pressure implausible
* Low Fuel Level or Fuel Tank empty
* Wiring and/or Connector(s) from/to Fuel Pressure Sensor (G247) faulty
* Fuel Pressure Sensor (G247) faulty

Possible Solutions

* Check Fuel Tank Level
* Check Fuel Pressure
* Check Wiring and/or Connector(s) from/to Fuel Pressure Sensor (G247)
* Check/Replace Fuel Pressure Sensor (G247)

Special Notes

* When found in VW Polo (9N) with 1.4l FSI (AXU), check TPI 2009218 which describes a problem with the Fuel Pump.

Hope it helps

Barry