Oxygen sensor code P1279

Tiny
KCOCKETT
  • MEMBER
  • 2004 NISSAN SENTRA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 98,000 MILES
Check engine light on within two days after bank 1 sensor is replaced with off the market or dealer sensor. Bank 2 sensor also was changed. Fuel pump and sensor, also air were replaced. What is the problem?
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Sunday, January 14th, 2018 AT 7:36 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,554 POSTS
Hello,

This code means you have a lean condition which probably has nothing to do with the oxygen sensors. It sounds more like a vacuum leak or you have a misfire.

Please run down this guide and do some checking.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Tuesday, January 16th, 2018 AT 10:27 AM
Tiny
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  • 3 POSTS
I am not experiencing any misfiring. There are no exhaust leaks. Engine running smoothly. What would cause a lean condition?
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Tuesday, January 16th, 2018 AT 10:59 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,554 POSTS
This code can be caused by a dirty MAF sensor. I suggest you clean it free and then clear the codes here is a guide to help you see what to do.

https://www.2carpros.com/articles/mass-air-flow-service

It might be too far gone and you will need to replace it.

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Please let us know what happens. No vacuum leak?

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Check out the diagrams (below).

Cheers, Ken
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Tuesday, January 16th, 2018 AT 8:31 PM
Tiny
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Mass air flow sensor has been replaced. I will clean as suggested. Thanks
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Wednesday, January 17th, 2018 AT 9:51 AM

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