Poor Fuel Mileage

Check fuel injection system.
Check intake air temperature sensor.
Check coolant temperature sensor.
Check barometric pressure sensor.
Check ignition switch.
Check idle position switch.
Check throttle position sensor.
Check camshaft angle sensor and crankshaft angle sensor.
Check power steering pressure switch.
Check A/C switch.
Check P/N switch (A/T models).
Check motor position sensor (1.8L).
Check airflow sensor.
Check oxygen sensor.
Check stepper motor (2.0L).
Check fuel injectors.
Check power transistor.
Check fuel pressure.