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

How to fix P0174 Code: System Too Lean (Bank 2) A Lean condition exists if the engine is getting more air than gas into the cylinders. (Air/Fuel Ratio is off). (How a P0174 Code is set.) The oxygen sensor is reading the amount of oxygen burnt off during combustion and is reporting the information to the computer. The sensor is reading there is more oxygen than should be on Bank-2 side of the engine. P0174 Code can be problematic to fix since it can be caused by several things. If there are other codes they can help point to the cause. Keep a look out for any exhaust leaks since that can throw the 02 sensors off and get bad readings. Possible Causes of a P0174 Code: Oxygen Sensor (Bank 2 Sensor 1) Bad Fuel Injector Vacuum Leak Other Possible Causes but Usually Would also Cause Bank-1 Issues (P0171 Code: System Too Lean Bank 1) Bad Sensor (MAF - MAP - IAT) Blocked Air Intake or Exhaust Bad Fuel Pump - Fuel Pressure Regulator - Clogged Fuel Filter How to Test 02 Sensor Video    • How To Test Toyota Upstream Oxygen Sensor ...   How to Test Fuel Injector Video    • How to Test Fuel Injector Circuit Using Te...   By using this information, the user assumes all risks of use.