2000 Subaru Impreza Outback Q&A
2000 Subaru Impreza Outback Question: P0171 how do i fix?
Understanding the background behind a lean code is the key to the repair. Essentially the computer can no longer compesate for a improper fuel mixture. The lean code can be set by a number of different components. The most common is a vacuum leak at a hose,gasket or even an oil cap that is not sealed properly. The other items would be a leak in the air intake system between the air cleaner and engine.Lastly a faulty sensor such as the Mass Air Flow sesnor or Oxygen Sensor. - Visitor