Question about 2008 Subaru Outback
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Posted on Jan 02, 2017
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Jul 04, 2012 | 2004 Subaru Outback 2.5
Oct 25, 2011 | 2008 Subaru Outback
P0171 indicates a lean condition. The most
common cause of this is a defective mass air flow sensor. Also check if any
vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
The code PO420 you have is Catalyst System efficiency is below threshold bank one. Usually replacing the O2 sensor that's the front most in the exhaust system will cure your problem,.
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