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The light is flashing probably because the computer isn't receiving a signal from one of the sensors. They are mounted around the center differential and tell the computer whether the rear wheels are spinning at a different speed than the front wheels, which would indicate the need to engage AWD. Check the wiring to ensure there are no breaks, and that the connectors are in good condition. If the light comes on and stays on rather than flashing, pull over and do not drive. The differential or an axle needs gear oil and will be destroyed if it doesn't get it.

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Q: Why is the 4x4 light flashing all of the time on your 1992 areostar electronic four wheel drive?
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