For a 2006 Toyota Corolla, what is the most common fix for a P0171 code?

Question

I have cleaned the air mass flow sensor, changed the fron o2 sensor about 6 months ago, along with the camshaft location sensor. Air filter has about 500 miles on it, and is still clean.

Answer 1

There is a factory service bulletin for that code. The factory recommend using and updated Air Fuel (A/F) sensor. Please see "Tech Notes" on the code P0171 Toyota  page. It's possible that you didn't use the updated Air Fuel (A/F) sensor when you replaced.

P0171 TOYOTA - Air/Fuel Mixture System Lean Bank 1

Read more: https://www.autocodes.com/p0171_toyota.html