Hi! Welcome to JustAnswer. I'm Ron Z and I'll be helping you with your question today.
Unfortunately, there is no easy, 1-answer, "it's this..." type of answer here. When the Stabiltrak Light comes on, follow by the Check Engine Light, this will be a part or sensor that is both used in the Stabiltrak system and is also monitored by the on-board computer. Unfortunately, there are literally dozens and dozens of sensors included here. However, there is a quick way to find out. You will need to have the Diagnostic Trouble Codes (aka "P-Codes") scanned from the on-board computer. These p-codes will more accurately point to the part or sensor that has the fault and from there an estimate for repair can be made. Good news is, you can have these p-codes read FREE (except in California) at any local "big chain" part store (ie. AutoZone, PepBoys, Advanced, etc).
As for the windshield wiper that does not work- this sounds like it will simply be a loose mounting nut on the wiper arm. At the base of the wiper arm, remove the plastic cap (if equipped) and tighten the nut. This should solve the problem.
I'm sorry I could not be more specific into the problem here, but like I say, there are too many possible causes to take a guess and be correct. Every mechanic's first course of action is going to be to scan those p-codes so they have a starting point.
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