Help - P0171

I'm still getting P0171 error on check engine light.
I've changed both O2 sensors, new catalytic converter (orginal got stolen), and cleaned MAF sensor to where it shines again. What else could i be looking at to change? First time ever check engine light comes on my 143K 2000 Tacoma v6.

 

P0171 is a lean code. this can be caused by a number of things. The most common being a vacuum leak. I suggest first inspecting every vacuum line and air inlet pipe from the MAF sensor to the engine. Start there.

 

I've just changed pcv valve and hose - light came back on

 

Seems that when I cleaned the MAF sensor, I cleaned it thinking that it fixed it to a working condition - the reality was that it was burned out and needed replacing instead of just a cleaning