I have to trouble codes that pop up which are

P0171- System Too Lean (Bank 1)

Causes A code P0171 may mean that one or more of the following has happened:

The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
There could be a vacuum leak downstream of the MAF sensor.


P0303- Cylinder 3 Three Misfire Detected

CausesA code P0303 may mean that one or more of the following has happened:

Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

Im guessing one of my fuel injectors are faulty cause the code P0171 which is lean and lean means my car isn't getting enough fuel hence my fuel injectors may not be working.

Can some one help me thanks.