Hey all, well my check engine light keeps coming on periodically. In no way does the performance decrease or anything noticeable. It only comes on, sometimes, after I've been driving around 10km. Its at very random times and it will stay lit until I shut the car off. All will be fine, til 3-4km down the road when it comes on again. It seems to only come on at highway speeds usually. there is nothing else illuminated just the check engine light. I'd just take the bulb out but I'd like to know what would cause it. I did swap out the ECU about 2 weeks ago, along with ignition coil, fuel pump etc. So basically, what on our motor will cause the check engine light to illuminate so I can work down the list to figure this out.... Thank you very much in advance, Andrew edit* I've also been driving this car for about 2 weeks with it coming on, if something was going, I think it would have broke by now... not sure though.