What would cause this light to come on? I have an R50 2003 mini. It has all the coolant hoses change and just had an oil change. Will need a new exhaust soon.

 

Check what fault code popped.

 

There are so many things that could cause this light to come on. Ideally you need a code reader ( scan guage , etc) or pay a shop to do it. This is only half the battle as you'll then need to fix the problem.

I would check that the level of coolant is acceptable as you've had recent work done here. Also check that your gas cap is tightened properly - if not, air will leak by causing the check engine light to illuminate.

 

When the oil change was performed, was the countdown-miles-clock till next inspection (service) reset?

 

any autozone will scan you for free

 

On s gen1 it will not set a service engine light....the miles to go when you turn the keys goes to a negative number....
But no yellow light....
To the OP.... Till you get the car plugged into a code reader....it is just a guess...there are THOUSANDS of codes......

 

Hi, on mine it turned out to be the pre-catalytic converter O2 sensor. The dealership wanted around $360 to replace it, but you can find the part for around $25.

 

Please point me in the direction of the $25 o2 sensor.