For those who have seen this light turn on and are curious about its source, know that it might be triggered by a variety of problems. Like you, I have an issue with my service light being on. As a result, I purchased a 'CAN OBDII Scan Tool,' which is a little piece of testing equipment that connects to the vehicle's OBDII socket, located in the driver's footwell. When you plug this device into your car's diagnostic port, it will do a scan of your engine management system computer and report any error codes it finds. Once the problem has been rectified, the device may erase the codes and return the Check Engine Light to its normal position. Make sure it fits your vehicle's make and year by looking it up on Amazon before you purchase it. I paid £12.00 + £8.00 for shipping and handling, and it was well worth the money. There are comparable parts that are more pricey and flexible.
I really hope the information above is useful.