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It is the powertrain/4x4/AWD malfunction indicator. It is the second indicator light covered in your owners manual if you have one.
I was looking at the 2006 Ford Explorer Owner Guide and the wrench light is the Powertrain Malfunction Indicator . It lights up when a powertrain or 4x4 fault has been detected , take it to the dealer
The powertrain control module has detected a malfunction with the 4x4 system Could be just one of the sensors - take it in and get it checked out - Helpfull
The powertrain control module has detected a malfunction - take it to a professional and get it checked out (Helpfull)
what need to do when indicator light is on
Malfunction Indicator Light
A malfunction indicator light is also known as a check engine light. It is a light on the dashboard of a car that goes on when there is a problem with the car's engine.
The overdrive off light will flash in your gauge cluster when a malfunction has been detected by the powertrain control module
A malfunction.
The O/D off light flashing indicates that the powertrain control module has detected a malfunction - have the Explorer scanned for trouble codes in order to diagnose and repair the problem
Your check engine light will come on if the powertrain control module has detected a malfunction with your emission control system - have the vehicle scanned for any trouble codes to diagnose and correct the problem
A malfunction indicator light comes on because a detector elsewhere in the item has noticed a malfunction in whatever it is monitoring.