Any help appreciated, i have had car fault codes read this morning due to yes you guessed it glow plug light flashing ! light appears when overtaking or on motor way basically when booting the car, if i stop and turn off light stays off but comes back as soon as i accelerate and goes into limp mode.

P0100 is the air mass meter and P0251 is related to pump metering fault cams/injectors etc.

is there a way of identifying which code is at fault as both codes could effect each other air mass is £150 quoted by Ford today but the other code could mean serious outlay - desperate not to go round in circles and spending a fortune in getting to the real cause of the problem.
thanks guys
Steve.