Poor Fuel Mileage
- Check intake air temperature sensor.
- Check engine coolant temperature sensor.
- Check barometric pressure sensor.
- Check ignition switch.
- Check throttle position sensor.
- Check camshaft position sensor.
- Check crankshaft position sensor.
- Check power steering oil pressure switch.
- Check A/C switch (if applicable).
- Check park/neutral position switch (A/T).
- Check oxygen sensor.
- Check airflow sensor.
- Check motor position sensor (if applicable).
- Check fuel pressure.
- Check for MFI system malfunction.
- Check for stepper motor malfunction.
- Check for fuel injector malfunction.
- Check for power transistor malfunction.