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Mike V.
Mike V., Auto Service Technician
Category: Car
Satisfied Customers: 25505
Experience:  25 years of experience, Certified Subaru Technician and Nissan factory trained.
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I Have a Nissan Sentra 2009 2.5 l and it give me a code P071

Customer Question

i Have a Nissan Sentra 2009 2.5 l and it give me a code P071 it says to lean
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: yes and it came back
JA: Are you fixing your Sentra yourself? What have you tried so far?
Customer: i did change the air filter
JA: Anything else you want the mechanic to know before I connect you?
Customer: what should i do with this code
Submitted: 8 months ago.
Category: Car
Expert:  Mike V. replied 8 months ago.

Thank you for your question!
My name is ***** ***** give me a moment to review your question and respond with the assistance you need!

Expert:  Mike V. replied 8 months ago.

Is the car running normally other then this code?

Customer: replied 8 months ago.
no problems
Customer: replied 8 months ago.
i did check the gas tank cap and it is ok
Expert:  Mike V. replied 8 months ago.

Ok, usually when this is the case the actual code is caused by a front O2 sensor that's reading out of range. It's seeing a lean mixture, but it may not be lean at all. What you really have to do is get a scan tool that can read the live data from the front and rear O2 sensors, then check to see what they are reading. Usually though the front O2 is the culprit causing the lean fuel mixture. This of course will cause the code to come up. Other things can do this, but when it seems to be running fine, I find it's usually this sensor.

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Thank you so much!