234-4445 (4-wire oxygen sensor): Downstream. 2006-2010 Subaru Forester 2.5L H4 Non-Turbo. 2006-2011 Subaru Impreza 2.5I 2.5L H4 Non-Turbo. 2006-2011 Subaru Impreza Outback Sport 2.5L H4 Non-Turbo. 2008-2009 Subaru Impreza Sport 2.5L H4 Non-Turbo.
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