My engine check light comes on intermttently which is concerning me as I've only just purchased the car. It is a W Reg UK Spec Turbo 2000. I'm just wondering if this is a common thing or if anyone knows what this light usually means. My friend seems to think it's either the lambda sensor or the egr valve is this possible as the car runs really well.

 

Get a PSI3 or VI Monitor connected and see what the code is. It may be something simple or even a loose item.

 

The light can mean loads of things.
Use this guide to read the fault code:
Scoobypedia | Trusted knowledge for everything Subaru | Knowledge / Reading ECU Fault Codes

 

get it checked asap..... I have had the same problem.... intermitant ??? light coming on

turned out to be the MAP sensor.

get the codes read pronto

 

Intermittant as in occasioally comes on

 

i take it the map sensor is what controlls the boost? out of interest what boost should a standard uk impreza turbo 2000 (w reg) be running?

 

used the method for reading the codes the other day, so simple. Every car should have that. Knock sensor on mine, £70 and simple to fit.