What do you mean by serviced? Sometimes the guy will disconnect the Air Temp Sensor to check the air cleaner, but theres no reason for the light to come on, unless something was left disconnected. You may need the code to know where to look for the problem,
A number of things but more then likely it is something the service people did, you can get it scanned at an auto parts store for free. You can also call whomever serviced you vehicle and tell them. The light can mean a sensor,low fluid,gas cap anything really. Hope this helps tim
Means they either didn't fix a problem or caused one.
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