Running rich - Nissan Forum
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post #1 of 2 Old Dec 29th, 2018, 09:17 PM Thread Starter
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Running rich

So after getting code P0171 I replaced my faulty mass air flow sensor on my 2010 nissan frontier v6 4.0 and that fixed that code problem. But after a day of driving I got codes P0172 and P0175 anyone run in to this problem or does anyone know what could be causing this

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post #2 of 2 Old Dec 30th, 2018, 08:38 AM
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Location: NJ (Philadelphia area)
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The P0172 and P0175 codes are caused by the Fuel injection system running too rich. The FSM states the following:

• Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.)
Possible cause:

Air fuel ratio (A/F) sensor 1 malfunction.
Fuel injector(s) may be dirty or leaking.
Exhaust gas leaks.
Incorrect fuel pressure.
Mass air flow sensor (MAF) defective.

When you replaced the MAF, it's possible that you disturbed some other harness connectors. Check the connectors for tightness and oxidation on the pins.

KA-T for life, yo!
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