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Originally Posted by dhorn64
My 99 blazer service 4x4 light would come on and off through out the day but now it stays on. I think it is a sensor but which one and where? How do I ckeck it. Help! I'm trading this in for a newby soon. Thanks
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Welcome on your first post on AF.
If you are going to fix it before you trade.
First thing check all fuses for power.
On a 99 with a 236 transfer case you will need a engine /transmission/ capable scanner to get codes that should point to the problem.
If you can get any codes post back code no.
MT