Wipers wont park if this tab is bent.
Close-up of bent tab that causes wipers to park up, not down.
Wiper transmission assembly under cowl panel on driver side.  If your wipers will not park when you shut them off, a common problem (especially in the winter) is that the park mechanism stop tab is bent.
1- Park mechanism stop tab.
It must be straight, and not ruined like this one.
2- Park mechanism removed.
Wipers won't park down
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