Replaced 2 cv axles, and front drive shaft in my 06 mountaineer. Now AWD won't engage, and always can't lock in in 4x4 with the setup button. Any ideas?

Asked by Robert Dec 12, 2019 at 04:26 PM about the 2006 Mercury Mountaineer Premier AWD

Question type: Maintenance & Repair

6 Answers

EDIT** Replaced both front CV Axles, and front drive shaft in 06 Mountaineer. Now AWD won't engage. Also can not lock it in 4x4 using the setup/info buttons. Any ideas?

Bob is on the right track. Perhaps something was damaged or disconnected during the axle replacement.

Look up a diagram of the vacuum system for the front axle and then take a look.

When we removed the passenger side axle, a bearing or gear came out with it. we were able to lightly tap it off and slide it back in. But could that be part of the problem?

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