Question about 2005 Subaru Forester
Subaru forester PO 171 code what may cause this code?
Your fuel system is too lean. It's typically the primary O2 sensor (on the pipe between the engine and the catalytic converter). The mass airflow sensor is also possible but the O2 sensor is a wear item requiring periodic replacement and is more likely.
Posted on Jul 14, 2010
Fuel trim malfunction (A/F too lean) Check for vacumn leak
Posted on Jul 15, 2010
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Posted on Jan 02, 2017
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