2010 Nissan Versa - P0171 Code

504 Views 5 Replies 4 Participants Last post by Desert Rodent, 6 d ago

AHART

Hello,

I have a Nissan Versa 2010 that in the past I had someone who put too much or the incorrect oil in the car and it also had a misfire. I have had the oil changed, spark plugs redone, and one of the coils replaced. Now the car is running lean so every time I am in idle it is surging. It was showing that the air fuel pressure sensor needed to be replaced so I have had that replaced and now the P0171 Code is popping up. Knowing what the car has been through what would you recommend as the next step for fixing this new code? Should I change the bank 1 O2 sensor or could this be the fuel pump. Maybe something just needs to be cleaned? No air leaks that I can visibly see. I am not knowledgeable with cars but would like to learn. I appreciate any incite I can get.

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Desert Rodent

· #2 · 2 mo ago

I tend to try the least expensive solutions before firing the "parts cannon" at a vehicle. I would probably clean the mass air flow sensor (with the proper cleaner) and try some good fuel injector cleaner in the tank.
After that I might check for vacuum leaks (using propane). If you are not comfortable using propane or brake cleaner to check for vacuum leaks, don't do it. Personally, I have a hard time finding vacuum leaks by sight or hearing and utilize propane.
just my two cents...

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amc49

· #3 · 2 mo ago

Vacuum leak is the most common cause but a clogged injector can do it too.

Curious about the 'changing out a cylinder' thing, you change entire motor to do that.

You can verify a vacuum leak by watching the O2 sensor i action on livedata with engine at warm idle. The high/low action instead of flashing between .1-.9 volt will lower in range to maybe .1-.6 or so, the range lowers as anything below .5 is lean.

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AHART

Discussion Starter · #4 · 2 mo ago

amc49 said:
Vacuum leak is the most common cause but a clogged injector can do it too.

Curious about the 'changing out a cylinder' thing, you change entire motor to do that.

You can verify a vacuum leak by watching the O2 sensor i action on livedata with engine at warm idle. The high/low action instead of flashing between .1-.9 volt will lower in range to maybe .1-.6 or so, the range lowers as anything below .5 is lean.

I am sorry I meant to say coil not cylinder

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thatgirladrienne

· #5 · 6 d ago

Desert Rodent said:
I tend to try the least expensive solutions before firing the "parts cannon" at a vehicle. I would probably clean the mass air flow sensor (with the proper cleaner) and try some good fuel injector cleaner in the tank. After that I might check for vacuum leaks (using propane). If you are not comfortable using propane or brake cleaner to check for vacuum leaks, don't do it. Personally, I have a hard time finding vacuum leaks by sight or hearing and utilize propane. just my two cents...

How do you check for leaks with propane?

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Desert Rodent

· #6 · 6 d ago

thatgirladrienne said:
How do you check for leaks with propane?

0:38 to 1:05 in video
Eric the Car Guy

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