Hey ...have 02 ranger 4x4 ..my 4x4 is not working,and they said the module is usually what goes out on them..i got the part number1L54-7H417-AD.. whats the difference in the last two letters? Do i have to get same or what?

 

Any of these numbers will work
1L54-7H417-AC
1L54-7H417-AD
1L54-7H417-AE

Last two numbers are software revision numbers I believe.

Yes, the 4x4CM is a common failure but it has specific symptoms.
Good read here on this issue: http://www.ford-trucks.com/forums/64...problem-3.html
Check the fuses, I believe there are 3 or 4 that are used in the 4x4 activation

 

Thanks for getting back to me on that...i wanted to know where the fuses are located for the 4x4 ? Ill check them first before i buy part..

 

On my 02 4x4 ranger i have another problem also...the oil guage bounces Sometime too.what could cause that? Thanks again for help..

 

Oil pressure is operated by a switch on the engine, below 6psi if is off, above 6psi it is on.
So it isn't actual oil pressure.

If needle is bouncing from 0 to 1/2 then probably a loose wire on the sender(switch) or the sender itself is bad.
If it is bouncing 1/2 to max. then resistors in the gauge could be bad.

Actual low oil pressure will cause an engine "ticking" sound you can hear, valve train noise.