Oxygen sensor code P1279

2004 NISSAN SENTRA
98,000 MILES • 1.8L • 4 CYL • 2WD • AUTOMATIC
Avatar
KCOCKETT
  • MEMBER
  • 3 POSTS
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?
Jan 14, 2018 at 7:36 PM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 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
Jan 16, 2018 at 10:27 AM
Avatar
KCOCKETT
  • MEMBER
  • 3 POSTS
I am not experiencing any misfiring. There are no exhaust leaks. Engine running smoothly. What would cause a lean condition?
Jan 16, 2018 at 10:59 AM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 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
Image (Click to enlarge)
Attached Media
Jan 16, 2018 at 8:31 PM
Avatar
KCOCKETT
  • MEMBER
  • 3 POSTS
Mass air flow sensor has been replaced. i will clean as suggested. Thanks
Jan 17, 2018 at 9:51 AM