Poor Fuel Economy

Definition
Fuel economy, as measured by an actual road test, is noticeably lower than expected. Also, economy is noticeably lower than it was on this car at one time, as previously shown by an actual road test.

POSSIBLE CAUSE ACTION

Dirty air filter Clean/replace As required



Fuel Metering Check Air/fuel ratio (O2 Sensor Voltage)
Perform Oxygen Sensor Test
Testing and Inspection

Check Fuel pressure.
Testing and Inspection