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Ok, first, you should clear the fault. Sometimes the system will get a bug, and there's not really a problem. You can do this by disconnecting the battery for 10-20 minutes. This will clear any faults. Next, see if the light comes back. If it does, then you can take it to get the codes scanned at a parts store(many do it for free.) Once you get the code and description, you have to troubleshoot the specific system that the code covers. The check engine lights are usually triggered by sensors going bad. On occasion, you will get an actual mechanical failure that will cause one.
Fix the problems with the 4x4 and clear all of the codes. You can try and disconncet the battery overnight, That should clear the code, But if the problem isn't fixed then It will come back on, maybe when you most need 4x4
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