94 Volvo 940-Service Light

[ashjerseygirl]

I am looking to purchase a used 94 4dr Volvo Sedan 940. The car was being charged when i came to look at it, because it had been sitting for a while. We took the car for a first test drive and my mechanic said the engine and transmission were really good. But when i took the car for a second test drive i noticed the service light on for a couple of minutes and then it went off. My mechanic said it could be a sensor. Is it worth the trouble?