edino

Difficult to tell without elaborative information like milage, age, maintenance record etc. Normally whining indicates an irreversable problem unless repair is done. Cound be wear and tear, lubrication problems, or mis adjustment of the gear wheels. Service attention to find the root cause is the only answer. Having said this, many cars can do lots of milage with whining differentials or gears with no reliability issues for a long time. best is to have a professional look at it and determine the root cause. This will tell if seriuos or not....

No... If the front is OK, no need to change. Not sure by the way why you have to replace the back. Its independent suspension, so I suspect you mean the bushes have worn?

there is not much info to over here... Could be many things, depending on the history of maintenance, milage and general condition of your car. Wat about the engine light on the dash, is it on? Have the dealer read the code and they probbaly can tell quicky what is wrong. Normally, if addressed early it are easy to resolve issues, these engines are bullit proof. But definetly do not drive long with this as it could cause damage...

Maybe the sensor or cable got damaged while removing the wheel, or putting it back on. The other possibilty is that if you used a compact spare tire, it may have triggered the abs light after driving a while as the diameter of the tire is smaller. this is not a defect, once putting back a regular size tire the light will go off aft driving a while.

I had a look at my wife's 2010 Edge... To access the plugs at the back you have to remove the manifold, and all it's bit and pieces. Unless technically inclined, I would not try it... Damage to any component could be very costly.....

Alternators are designed to resist water, and can even work temporally while submerged. Washing the engine bay is not the cause by itself, but likely the alternator was in a poor condition already and that was probably the main cause it died after washing. Likely some of the isolation of the windings within the alternator had cracked due to age or manufacturing error, and than water is the big enemy. Soon or later your alternator would have stalled anyway, regardless of engine bay wash or not. In-fact, if water affects your engine performance, like electronics, than in most cases that points to a defect that was already there, and should be resolved regardless. Like everything, fixing the root-cause of a problem is the only good fix...