Oxygen sensor code P1279

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?

Sunday, January 14th, 2018 AT 7:36 PM

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 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

KCOCKETT

MEMBER
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

KEN L

MASTER CERTIFIED MECHANIC
48,363 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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