hi, was driving absoluty fine, then suddenly went into limp mode, turned off, restart and would rev at around 1500rpm on its own at idle, then went to bring into workshop and vehicle wont start now?? fault codes are P0340 phase sensor and P0641 power supply? any one had this problem? have got continuity in sensor and only recieving 5v at plug? any one no what power should be sent to the sensor?