Help / advice please

[TG M]

Hi there hope you can shed some light / advice please.I have a 2011.Rav4 D-4D, manual, with 88k on the clock. Driving to work approx 1 week ago came away from roundabout approx 30mph, car lost power and had white smoke coming from exhaust and part of the front.  The engine check light came on, so did the VSC, the steering wheel light and control unit says check 4 x 4 system.  No previous warnings, checked the signs for head gasket, ie coolant etc all looked ok. Car wouldn't start after this and had to get it towed to garage. Car is still under warranty (scotsure warranty). Fault reader so far has shown startability issue P1604. Any one experienced this before please and any advice is v welcome. From what I've read it could be injector held open causing the white smoke etc. Hoping it's not a costly fix