Toyota Corolla 2001 1.8L with engine code P0171

Question

I have replaced 2001 Corolla with a new air filter, MAF, spark plugs, and fuel injectors. Tomorrow I will replace the PCV of the car and check its hose connection. Toyota mechanics wanted me to pay $800 for their fuel injectors because they said the ones I bought from ebay and replaced the car with were faulty. I had 3 codes before the fuel injector change, only p0171 remains.

Answer 1

you may have a bad oxygen sensor (bank 1)

Answer 2

P0171 Toyota Code - Fuel Trim System Too Lean Bank 1
Read more: https://www.autocodes.com/p0171_toyota.html