speedo stopped working this morning didnt think anything of it until tonight when after about a 15 minute drive the check engine light came on then i realised that at about 3 and a half thou no boost at all engine just sounded like it had hit the limiter can anyone please help!!!!!!!!!!

 

If the speed sensor signal to the ECU is not present then the ECU restricts itself to limp home mode like you desribe. You need to sort the speed sensor or its wiring.

 

ah thanks for that but how do i go about acting on this information then?

 

You need to check your speed sensor - and the circuit supporting it!

 

http://www.ravensblade-impreza.com/m...agnosisegi.pdf
http://www.ravensblade-impreza.com/m...ingdiagram.pdf

Note you use the correct wiring/procedure for your model year.

If this all makes no sense to you get someone else to do it