Codes P1274 and P1283?

Tiny
TBRATT11
  • MEMBER
  • 2004 NISSAN 350Z
  • 3.5L
  • V6
  • TURBO
  • 2WD
  • MANUAL
  • 98,000 MILES
Hello, I am having the same problem as https://www.2carpros.com/questions/p1283-nightmare but I am getting the code for both. I have the turbonetics turbo kit installed had it for about a year and now I am getting the codes. I have replaced both o2s. Can't seem to find the problem.
Tuesday, July 11th, 2023 AT 6:03 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 44,198 POSTS
This can be a vacuum leak, low fuel pressure/delivery, bad fuel injectors or a bad. Please go over this guide:

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

I have seen the MAF sensor cause this problem.

The P1274 and P1283 codes in a 2004 Nissan 350Z are related to the air-fuel ratio and indicate issues with the Bank 1 or Bank 2 Air-Fuel Ratio (A/F) Sensor. Here's some information about each code:

P1274 - Air-Fuel Ratio (A/F) Sensor 1 Lean Shift Monitoring Bank 1
P1283 - Air-Fuel Ratio (A/F) Sensor 1 Lean Shift Monitoring Bank 2

Use this guide when the engine is cold only:

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

The fuel pump could be getting weak as well. Check out the images (below). Please let us know how it goes

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Tuesday, July 11th, 2023 AT 5:35 PM

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