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Horn blowing and service light are they related? 850 1996

96 850 turbo wagon, just completed a head job. Three days later the service light is on and the horn (center fire wall) blows eratically, even when the car is off or driving. The service light goes out in 2min or less. Are these two related and does anyone have suggestions. Currently I have disconected the horn thing and still drive. Oil & temp are fine, boost and diving seems normal.... Also I would like to aquire a vacuum diagram for my records any suggestions?
Thanks
Drivncrazy






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