P0171 Code.. O2 sensor?
09-23-2007, 10:29 AM
#1
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P0171 Code.. O2 sensor?
I got my first SES light at 100K and it's a code P-0171, "Too lean bank 1". The Autozone guy says that's an O2 sensor and wants to sell me the $150 version.
I have never replaced the plugs so I thought I would try that first.
If it's the sesnor, can I use a "universal" O2 sensor? 2-wire, 3-wire or 4wire? Bosch makes some reasonably priced units and I can re-attach the factory connector plug if necessary
Thanks
I have never replaced the plugs so I thought I would try that first.
If it's the sesnor, can I use a "universal" O2 sensor? 2-wire, 3-wire or 4wire? Bosch makes some reasonably priced units and I can re-attach the factory connector plug if necessary
Thanks
09-23-2007, 10:44 AM
#2
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Join Date: Jan 2007
Location: LI NY
Posts: 78
I got my first SES light at 100K and it's a code P-0171, "Too lean bank 1". The Autozone guy says that's an O2 sensor and wants to sell me the $150 version.
I have never replaced the plugs so I thought I would try that first.
If it's the sensor, can I use a "universal" O2 sensor? 2-wire, 3-wire or 4wire? Bosch makes some reasonably priced units and I can re-attach the factory connector plug if necessary
Thanks
I have never replaced the plugs so I thought I would try that first.
If it's the sensor, can I use a "universal" O2 sensor? 2-wire, 3-wire or 4wire? Bosch makes some reasonably priced units and I can re-attach the factory connector plug if necessary
Thanks
this code says that its running lean on the right bank
this can caused by alot of stuff
I Intake air leaks
I Heated oxygen sensor 1
I Injectors
I Exhaust gas leaks
I Incorrect fuel pressure
I Lack of fuel
I Mass air flow sensor
I Incorrect PCV hose connection
check these in order of cheapes to most expensive to test/replace
Last edited by justinny; 09-24-2007 at 04:00 PM.
09-23-2007, 05:00 PM
#3
use and exact replacement only
this code says that its running lean on the right bank
this can caused by alot of stuff
I Intake air leaks
I Heated oxygen sensor 1
I Injectors
I Exhaust gas leaks
I Incorrect fuel pressure
I Lack of fuel
I Mass air flow sensor
I Incorrect PCV hose connection
check these in order of cheapes to most expensive to test/replace
this code says that its running lean on the right bank
this can caused by alot of stuff
I Intake air leaks
I Heated oxygen sensor 1
I Injectors
I Exhaust gas leaks
I Incorrect fuel pressure
I Lack of fuel
I Mass air flow sensor
I Incorrect PCV hose connection
check these in order of cheapes to most expensive to test/replace
09-23-2007, 05:48 PM
#4
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Is there a way better pinpoint the problem with the code reader?
The light came on right after I checked my air filter. I re-checked and it was seated correctly and is clean.
If it's the MAF, it is a cleaning or a replacement?
Thanks
The light came on right after I checked my air filter. I re-checked and it was seated correctly and is clean.
If it's the MAF, it is a cleaning or a replacement?
Thanks
09-23-2007, 10:58 PM
#6
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From what I can tell, the 01 Max has 3 O2 sensors, front front right, front front left and rear. http://www.trademotion.com/partlocat...layCatalogid=0
Does it make sense to replace the O2 sensor for bank 1 since that's the code I'm getting. If it was the MAF I would think I would get a different code.
Thoughts?
Thanks
Does it make sense to replace the O2 sensor for bank 1 since that's the code I'm getting. If it was the MAF I would think I would get a different code.
Thoughts?
Thanks
09-24-2007, 04:33 PM
#10
09-24-2007, 05:32 PM
#11
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Autozone has rebuilt units with a 1 year warranty....
I took mine out and cleaned everything. Still have the SES light. How many "cycles" (start/shut off) before the light clears itself...or not...
Thanks
I took mine out and cleaned everything. Still have the SES light. How many "cycles" (start/shut off) before the light clears itself...or not...
Thanks
09-24-2007, 05:45 PM
#12
09-24-2007, 06:07 PM
#13
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Join Date: Jan 2007
Location: LI NY
Posts: 78
cause its easy to find and most ppl have 1 near them
it also gets an idea of what the part could cost
have you replaced the o2 sensor or was it replaced
youre probably about due for them (all) anyway if you havnt at 100k miles
if that dont get it
check the intake manifold on the cylinder bank closest to the windshield for leaks
if you had this code for both bank1 (P0171) and bank2 (P0174) then id suspect something upstream of where the manifolds diverts the air to the 2 banks such as the maf because then both o2 sensors (sensors 1, bank 1 & 2) would show lean conditions and compensation would be way out of range
you have 4 o2 sensors 2 before and 2 after the cat
it also gets an idea of what the part could cost
have you replaced the o2 sensor or was it replaced
youre probably about due for them (all) anyway if you havnt at 100k miles
if that dont get it
check the intake manifold on the cylinder bank closest to the windshield for leaks
if you had this code for both bank1 (P0171) and bank2 (P0174) then id suspect something upstream of where the manifolds diverts the air to the 2 banks such as the maf because then both o2 sensors (sensors 1, bank 1 & 2) would show lean conditions and compensation would be way out of range
you have 4 o2 sensors 2 before and 2 after the cat
09-24-2007, 09:17 PM
#19
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Join Date: Jan 2007
Location: LI NY
Posts: 78
ok this code is basically saying that the car is running lean, and no matter how the ecm tries to compensate it is unable to richen the mixture enough
each cylinder bank is monitored separately for this by the heated oxygen sensors (sensors1, bank 1 & 2)
the code he got is saying bank 1 is not compensating - P0171
bank 2 is fine at this point
if the maf was bad it would effect both o2 sensors not just 1 since it is before the manifold
each cylinder bank is monitored separately for this by the heated oxygen sensors (sensors1, bank 1 & 2)
the code he got is saying bank 1 is not compensating - P0171
bank 2 is fine at this point
if the maf was bad it would effect both o2 sensors not just 1 since it is before the manifold
09-25-2007, 08:22 PM
#21
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I'm still digging and will let you know what I find out. I tend to agree that it's not the AFM, but who knows. I did find a new AFM part number 22680-2Y001 that goes for $78 brand new. It would be a cheap first pass, but I'd have to have the ECM re-programmed...
09-26-2007, 06:39 PM
#22
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Update and end to the story.
I called and my local Nissan dealer had an opening so I took the car in. They checked it with CONSULT and found it WAS the AFM. They sold me the new one at the on-line price and charged me $120 for the diagnosis, installation and re-program of the ECM. As it turns out, my ECM had the latest software.
So now the light is off and the car is running great and best of all it just took an hour and a half of my time.
What's interesting is the only code was the P0171 yet is was the AFM that was bad.
Thanks for all the help!
I called and my local Nissan dealer had an opening so I took the car in. They checked it with CONSULT and found it WAS the AFM. They sold me the new one at the on-line price and charged me $120 for the diagnosis, installation and re-program of the ECM. As it turns out, my ECM had the latest software.
So now the light is off and the car is running great and best of all it just took an hour and a half of my time.
What's interesting is the only code was the P0171 yet is was the AFM that was bad.
Thanks for all the help!
09-28-2007, 03:22 PM
#24
thanks for the help
someone replied with a picture 5 days ago!! http://forums.maxima.org/showpost.ph...5&postcount=15
and you felt the need to reply with "yes"?
someone replied with a picture 5 days ago!! http://forums.maxima.org/showpost.ph...5&postcount=15
and you felt the need to reply with "yes"?
Last edited by SoonerFan; 09-28-2007 at 05:48 PM.
09-28-2007, 04:20 PM
#26
09-30-2007, 12:22 AM
#28
I'm suffering from the same error code. The P0171 arrived shortly after I cleaned the MAF (CRC's MAF cleaner, directions were followed) to correct the problem where the car with erratically stall at random times (especially sitting at a light).
So here's the deal (results of) with MAF cleaning:
1) Car idles normally at lights and does not stall.
2) Gas mileage went up about 2MPG.
3) SES light comes on with P0171.
4) Car hits fuel cut-off between 4500-5000RPM.
5) Even though Chevron Premium (93) or BP/Amoco (93) is used, I'm now getting pinging (valve clatter) under moderate to hard acceleration beyond 2500RPM.
So my questions:
- How did I screw up the MAF (by making it super-squeaky clean?)
- I've read that the faulty MAF can cause the car to not want to go about X RPM (4500 being a common number). Can a faulty MAF also provide excellent idling, good MPG, but screw up mixture to cause the valve clatter?
Thanks.
So here's the deal (results of) with MAF cleaning:
1) Car idles normally at lights and does not stall.
2) Gas mileage went up about 2MPG.
3) SES light comes on with P0171.
4) Car hits fuel cut-off between 4500-5000RPM.
5) Even though Chevron Premium (93) or BP/Amoco (93) is used, I'm now getting pinging (valve clatter) under moderate to hard acceleration beyond 2500RPM.
So my questions:
- How did I screw up the MAF (by making it super-squeaky clean?)
- I've read that the faulty MAF can cause the car to not want to go about X RPM (4500 being a common number). Can a faulty MAF also provide excellent idling, good MPG, but screw up mixture to cause the valve clatter?
Thanks.
09-30-2007, 03:00 PM
#30
09-30-2007, 11:15 PM
#31
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Rosenthal has the MAF for $78 (www.mazda-parts-dealer.com - They sell Nissan and Mazda parts) Part #22680-2Y001 (for 2000-2001 model year).
What I found (and the Nissan tech confirmed) is that the MAF goes bad (most likely gets dirty, but other things can happen) and one side (bank 1) throws a lean code when in fact both side are lean (due to the bad MAF), but bank 2 is not quite lean enough to throw a code. It's misleading and the OBD codes are more general. The Nissan CONSULT tool actually gives MAF readings for each bank.
What I found (and the Nissan tech confirmed) is that the MAF goes bad (most likely gets dirty, but other things can happen) and one side (bank 1) throws a lean code when in fact both side are lean (due to the bad MAF), but bank 2 is not quite lean enough to throw a code. It's misleading and the OBD codes are more general. The Nissan CONSULT tool actually gives MAF readings for each bank.
10-02-2007, 07:27 AM
#34
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10-02-2007, 09:18 PM
#35
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According to Nissan, your car needs the lastest ECM software after you put in the new MAF. The deaaler will hose you about a hundred bucks to do that...unless you know it's got the latest software.
10-13-2007, 06:48 PM
#36
I just got my brand-new MAF today. I even see the little handy-dandy insert from Nissan talking about the ECM reprogramming. Can I install this new MAF even if my software is out of date (I have no damned clue)? I'd rather install it myself, and then have the ECM version checked out versus taking them the part and getting bent over with them replacing it. 
10-14-2007, 02:29 AM
#37
If it works, then no, if you have problems, then yes, you need a 'reflash'.
It has been noted that some members have not required the dealer 'reflash', because their car did not have any adverse affects from a new MAF.
It has been noted that some members have not required the dealer 'reflash', because their car did not have any adverse affects from a new MAF.
10-14-2007, 07:45 AM
#38