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"service Now Light" Please Reply Fast Need Help

05-13-2007, 04:46 PM
Hello, i am really confused with my 85 eldorado... the service light came on out of no where and the car seems to be running perfectly fine. With past cadillacs, when the light came on it was an obivious problem, but now i don't know what needs to be done... what are the things that can trigger a service light to turn on?

thank you


05-13-2007, 05:58 PM
Welcome to AF, about 30 codes are available thru the obd. Especially after 20 years! Go to for for the procedure to retrieve the codes and what they mean.

05-14-2007, 02:23 PM
Best guess with the CEL and running OK, oxygen sensor would be the first suspect. As MW noted, you need to pull the codes first.

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