My 1999 Isuzu Trooper has "Torque on Demand" and the computer graphic started flashing "check". I took it to a mechanic who put it on the computer and it didn't indicate that anything was wrong. I checked both differentials for oil and they were both filled. When I depress the 4WD on demand button the lights goes out. The vehicle only has 95,000 miles on it and it's hardly been driven for the two years. Due to the recent price of gas, I've put 1235 miles on it in the last 18 months. Could the lack of use have caused the in-dash computer to go hay-wire?
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