Join Date: Oct 2010
Location: I would rather not say
Exactly which version of 1.9 JTD do you have? 105 (CF2, 3-pin diagnostic socket) or 115 (CF3, 16-pin OBD diagnostic socket) hp? No matter which. Something is quite wrong with the diagnostics you've done. The car can not have rail pressure of 43 bar and be running at all. The rail pressure should be at least 150 bar for the engine to run. At idle it should be around 300 bar if everything is OK. This DTC P1191-Fuel Rail Pressure Sensor Low shows that rail pressure has dropped under its lower limit (150 bar) so that's why the car has died at time time. Check your rail pressure sensor. It could be either the rail sensor or the high pressure pump that is making the problem. Do a good diagnostic once again. As i said your rail pressure at idle should be 300 bar and 1350 bar at WOT and rpm above 3500 (not stationary, on the road).
Check your battery, if voltage is low it could do some nasty things on the electronics of the car.
Hope i was helpful.