Causes and Fixes Chevrolet GMC P0174 Code: System Too Lean (Bank 2) 

How to fix Chevrolet or GMC P0174 engine code: System Too Lean (Cylinder Bank 2)
A P0174 Code is set when the Bank-2 upstream sensor-1 oxygen sensor reports a lean air-fuel mixture.
A lean condition exists if the engine is getting more air than fuel in the cylinders. (Air/Fuel Ratio is wrong)
P0174 Code can be problematic since it can be caused by many things.
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Possible Causes of a Chevy/GM P0174 Code
Oxygen Sensor (Bank 2 Sensor 1)
Exhaust Leak
Mass Air Flow Sensor (Codes P0100-P0104)
Clogged Fuel Filter
Fuel Pressure Regulator
Weak Fuel Pump
Vacuum Leak
Bad Fuel Injector
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