AIR Fuel Ratio

Scan Tool Range 0.0 to 25.5. Air Fuel Ratio indicates the PCM commanded ratio of Air to Fuel. In closed loop, the Air Fuel Ratio should normally be around 14.2 - 14.7. A lower Air Fuel Ratio indicates a richer commanded mixture, which may be seen during Power Enrichment or TWC Protection modes. A higher Air Fuel Ratio indicates a leaner commanded mixture. This can be seen during Decel Fuel Mode.