2001 Toyota Tundra P0171

I am going to try and test the MAF per the method above.

2001 toyota tundra p0171. After replacing the four sensors and the bank 1 Catalytic Converter the CEL still pops on after resetting so I changed the Plugs PCV Air Filter Fuel Filter replaced some of the vacuum lines after inspecting them cleaned the MAF added sea foam to gas tank. I have three Toyota right now. Mallege Mattieo96 Luv my yota and 9 others like this.

I found fuel trim to be positive indicating a lean. - Fuel injection system does not operate properly. 2001 Tundra I am so perplexed.

I have a 2001 Tundra 5 spd 4WD SR5 Access cab with a 5VZFE 34L V6. Then it suddenly died and wouldnt restart. At 70K miles about 2 years ago my highlander started running extremely rich and would just about run.

P0171 Lean is a very common fault code on Toyotas. I replaced the airfuel ration sensor 220 vs 140 for the O2. We drove around and recorded the voltages for the sensors -- 30 Volts during idle above 38 Volts.

Now they are hearing an air leak by the Master Cylinder and Brake Booster but are not sure if the MC is the issue or the BB. The P0174P0171 codes Fuel system too lean banks 1 and 2 usually means a vacuum leak from the intake manifold gasket a vacuum hose PCV hose etc or the MAF is dirty or theres a fuel delivery problem clogged injectors fuel pump going out etc. The cost to diagnose the P0171 TOYOTA code is 10 hour of labor.

Maybe someone will search P0171 and see this and not follow in my foot steps. Check engine light came on within about an hour same code P0171. Dirty or faulty mass air flow sensor.