2005 Toyota Corolla 1.6 "noise coming under air filter" Questions

...coming on with a P0171 engine to lean code. What else could be wrong or cause this? The only thing I have left to replace is the mass air flow sensor. Would this be recomended as the next step as to ...

...noise coming grom back of engine. Sound like under the air filter or intake. Only buzzes whn stopped idling. Noise stops whn you rev the engine remove the air filter and carefully run the engine to ...

...noise is coming from just in front of the passenger side, and under the dash. I can't hear the noise at all under the hood. Check the fan assembly probably located behind your glovebox. The fan could ...

...noise coming from the heater blower motor if you car is equipped with cabin filter to filter the air entering the blower right, blower motor can be touching to sides of its housing since its bearing ...

...noise like an air pressure hoes leaking and hosed located by passenger fire wall hoes missing but dont know where it goes car idles really weird and lack of power its an air hose from the air intake ...

...noise has started coming from under my glove box. thi stops when i press in the air circulaion button and immediately after letting go of the circulation button it stats again?? any ideas Could be ...

...noise coming from the air intake area where the air filter is located it is not continuous but it happens often and now for a longer period of time. The second is a clicking noise that comes from the ...

...noise periodically from under the car and still blowing hot air. Can hear the compressor making noise, but it's not blowing cold.  I am trying to troubleshoot before I bring it in. If I can have ...

...does the noise come from? Inside or outside the vehicle? If coming from under hood area, check for air filter cover and intake hose for being secure. Also check for any loose/disconnected vacuum ...

...I have a popping noise coming from the air filter box. What is this and how can you fix it? There is a hose underneath they tend to blow out or burn & may need replacement under the intake ...