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Reset the ECU. Do this by removing the fuse for the clock/radio for about 10 seconds.
Restart the engine, if the 4ws light stays on then you have a problem and should get it checked out. If the light os not on, then no worries.
With regard to problems with 4ws, if you are reversing and slightly clip a curb then the 4ws will be shut off automatically to prevent any possible damage. Sometimes, slow full-lock parking maneouvres can make the ecu believe there is a problem and it shuts the 4ws down. This happened to me, resetting the ECU solves the problem.
If the 4ws light goes off, but comes on when you are driving, you might just have a faulty sensor. If the 4ws works when parked, then there would seem to be no problem with the mechanism.
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