Nissan 2008 3.5 code po171 & po174, help

Question

already changed MAFS, intake & tuneup

Answer 1

Since you are getting both codes, it's very likely that there is an intake leak. If there are absolutely no intake leaks, you may have to replaced the A/F sensor (front O2 sensors).

P0171 NISSAN - Fuel Injection System Too Lean Bank 1

Read more: https://www.autocodes.com/p0171_nissan.html

P0174 NISSAN - Fuel Injection System Too Lean Bank 2

Read more: https://www.autocodes.com/p0174_nissan.html