For me, such a problem concerned damage to the shaft position sensor. The error was not displayed when trying to start, the starter spun but did not ignite. He lit it was ok. Enthusiasm and nothing, and then problems again. After the exchange, calm.
Welcome to the 2.0i frontera I have a problem the car has LPG the gas indicator light on petrol does not start the starter turns, I removed the clamp I moved the cables the engine was already cold and started please give me some info what it could be 666273347
it is very possible that this double relay, as Col. Ociz wrote, one section turns on the fuel pump and the other plus on the coil and maybe the injection / sensors too, often there are cold February in it