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There is only one sensor, it's called the oil level/quality sensor.
The countdown is based on an algorithm which reads in info such as time units, miles spent at lower speeds, miles spent at higher speeds, miles spent at idle, etc to calculate the proper time to have the service done. I believe in the US it always starts at 10,000 miles and 2 years. It also looks at the oil quality, both the initial reading (which is a reflection on how good the oil is when new, dino vs synthetic, etc) and also a running calculation on the contamination factor of the oil through it's life by measuring it's capacitance, which also will change the time/distance remaining to the next service.
Gilly
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