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  #1  
Old 01-28-2012, 02:52 PM
nissan1212 nissan1212 is offline
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2005 Altima
 
Join Date: Jan 2012
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Exclamation p1273 help!!!!!!!

Ok so about a month ago i got a ses light. (2005 altima SE V6 no mods as of right now) I pulled the codes and it read p1273 lean shift detected. So i replaced B1 S1 and it came back on after i cleared the codes. I had P1273 again. So replaced B1 S2. And it still came back on. So i went digging. Did a smoke test and found no leaks in the vacuum. I tested the current in the sensors that i had replaced and they where fine. Tested the mass air flow sensor. It was bad. I replaced that. And the SES came back on with the same code. . So now im at a loss i have no idea what next step i should take.


No perfromence issue the car runs fine.
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  #2  
Old 01-28-2012, 08:02 PM
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bennyb53 bennyb53 is offline
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2019 Sentra
2002 Altima
 
Join Date: Jan 2011
Location: Hawaii
Posts: 2,105
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Its not B1 O2S2. Its B1 O2S1. Bank 1 is the side where Cylinder #1 is. Check this out:

OBDII Code P1273 NISSAN - Air Fuel Ratio (A/F) Sensor 1 Lean Shift Monitoring Bank 1 | Engine-Codes.com
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  #3  
Old 05-25-2012, 09:04 AM
04sentra 04sentra is offline
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2004 Sentra
 
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any luck with your car? my 04 sentra is having the same problems.
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  #4  
Old 06-29-2012, 07:37 AM
Stealthm Stealthm is offline
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2006 Altima
2005 Altima
 
Join Date: Jun 2012
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Check this thread, same problem with mine and another guy..
p1273

Below is my issues..

I have the same problem with my 2005 Altima..

I found that following could be the issues with P1273..

-Air fuel ratio (A/F) sensor 1 Bank 1
- Air fuel ratio (A/F) sensor 1 heater Bank 1
- Fuel pressure
- Fuel injector
- Intake air leaks
- Air Flow Meter (aka MAF sensor)
- Bad Catalytic converter..

I went to the dealership for an diagnostic.. the report came back with "replace blank 1 and Blank 2 O2 sensor".. which I did and the code came up again.. in couple of hours.. So, went back to the dealership and they said it could be the MAF sensor.. I did not want to spend another $300 bucks to replace the MAF so.. I have another Altima 06 .. with which I exchanged the MAF.... and guess what ..the code is back again after a couple of hours.. and my 06 Altima did not show any codes..

Then.. I found online that you need to erase the code and erase all ECU learning ... which I did (followed all procedure).. and the code was back again.. the next day..

I did more research online.. and I also found that the Altima is notorious for throwing P1273 code especially the 04 and 05 Altima's.. the dealer told me that because I used after market O2 sensor (AF sensors) that's why it could be still throwing codes.. he said I should have used OEM Nissan O2 (AF sensors)... I brought NGK O2 sensors from partsource.. I dont think the O2 sensors are causing the problem in my car...

What I noticed with my 05 that during cold starts.. my car does not crank up in the first go.. unlike my 06 ...also as soon as the 05 starts.. I can smell the fuel in the air.. so, I suspect I need to get the Fuel injectors cleaned and check if they are running properly also my fuel pump pressure ... and the last thing then would be the Cata.. I found that if your cata is not working properly the rear blank O2 (AF sensor) can also throw codes....I have an appointment with the Nissan Service center on Tuesday... lets see what comes of it..
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  #5  
Old 11-02-2020, 12:09 PM
KeithDiehl KeithDiehl is offline
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2004 Murano
 
Join Date: Oct 2020
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I was just able to solve this on my 2004 Murano (200k miles). I got codes p1273 and p1800. I ran a bottle of cat-a-clean through and then left the battery unconnected overnight. I drove about 50miles with multiple stops yesterday and passed smog (no codes) today.
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