Codes P1274 and p1283?

2004 NISSAN 350Z
98,000 MILES • 3.5L • V6 • TURBO • 2WD • MANUAL
Avatar
TBRATT11
  • MEMBER
  • 1 POST
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.
Jul 11, 2023 at 6:03 AM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 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

Images (Click to enlarge)
Attached Media
Attached Media
Jul 11, 2023 at 5:35 PM