Hi I've an 07 focus st but I jumped into it the night away for some reason it isn't boosting right ? Only up to 1/4 on the gauge so I checked the on board computer and it put up
Dtc#1 is d900 ???
And
Dtc#2 is e510 ??? Can anyone help me out cheers Kyle 07922559153

 

D900 works out to U1900. E510 works out to U2510.
I doubt if that's your problem. Unless the boost gauge is showing to less boost, while the actual boost is still correct.

is the MIL on? Then get the codes read by a scanner.
Otherwise measure/read with a scanner the actual turbo boost, the boost control setting, the pedal position and things like that.

 

more than likely the boost solenoid, very common.

 

Does sound like the boost solenoid valve playing up.

http://www.focusstoc.com/forums/topi...oosting-right/

 

had it at my local garage there (ex-ford) and they can find anything with there diagnostics any help on this would be a great help*
I've ordered up a boost solenoid as well to try that but if this is away would it not put a light on ?
Has anyone on here had this ?

 

No the gauge is reading right and u can feel it in the car it's dead but still goes up the rev range ok

 

the boost solenoid doesn't put a light on.