I really hope someone can help me. My Zafira 2.2 (Z22YH Enginge) Petrol went into limp mode and the amber spanner light came on. The RAC diagnosed a code P1191 Low Pressure Fuel input Sensor. My local garage have had it for 3 days now and still have not been able to diagnose the problem. When I called in to check on progress the Exhaust Emission light had come on and the garage told me it is misfiring on cyclinder 3. They are not sure what the problem is. I had fitted in 2009 a new Siemens Fuel Pump and Vauxhall have told me that via a silent recall my Zafira had a new fuel pressure regulator fitted in 2010 it has a white spot on it not sure what that means and the last five digits on the the regulator is 338 09. I also had a new fuel filter fitted in 2009. The Swirl Valves have also been repaired and new timing chain fitted. From reading this forum and others I guess it's the Fuel Regulator or Fuel Pump. Here is my question how can the garage tell if it is the regulator or pump. If it is low pressure does that mean the regulator? If the pump failed would the car go into Limp Mode. I don't want to spend money on something that is not broken. Can anyone suggest what the problem is Vauxhall have informed me that a new regulator would be £110 plus VAT. Any help is much appreciated. Thank you.