Question about 2000 Subaru Outback

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I am getting a P0420 code and a P0171 code on a 2000 Honda Passport 3.2 V6 What do I need to do to fix these? Car seems to drive fine and not in limp mode.

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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,.



Thanks.

Posted on Oct 01, 2010

Testimonial: "Thank you very much. I will try cleaning the air flow sensor today. I will also swap the upstream 02 sensors and see if the code switches to the other"

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