H22 - Check For Unmetered Air Leaks

Fuel calculations can be affected by unmetered air leaks.

- Carefully inspect the following areas for potential air leaks.
- Hoses connecting to MAF.
- Hoses connecting to Throttle Body.
- Intake manifold gasket leaks.
- PCV disconnected.
- Vacuum lines disconnected.
- Improperly seated dip stick and tube.

- Are there any air leaks?

YES -- Air leaks located. REPAIR source of air leak. COMPLETE PCM reset to clear DTCs. COMPLETE a HO2S monitor drive cycle.

NO -- Go to H23. H23 - Check of HO2S Circuit Wiring With PCM Connected