Have you ever had it on your car where a light comes up on the dash such as brakes need replacing or bulb gone and after you have replaced the part or fixed the issue the light on the car dashboard is still on?
This can be frustrating and can cause problems when it comes to selling a car as people are dubious about buying a car showing faults. Often the car will need to be taken to a garage that can put it on a diagnostic machine and reset the code before it will be removed.
This may cost you about £30 to do so, but do contact a few different garages for quotes as you may find one cheaper and main dealers are often not the most competitively priced.
If the lights still stay light after this, it may point to a more serious fault that will usually be picked up on a diagnostic anyway.