Engine management light.
 

Hi.

I've started my 04 WRX today to find the yellow engine management light is on. I'vs driven the vehicle and it's perfectly fine with no symptoms at all. Any ideas as to what it could be?

It must be something trivial for it not to affect the performance.

Cheers.

Floydy.

Need to get it plugged in and the code read mate.

get yourself one of these:

keep it in the car and use it when a code pops up - for the sake of 5 quid you'll know what the code is and be able to reset it if needs be.