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AIR Fuel Ratio
Scan Tool Range 0.0 to 25.5. Air Fuel Ratio indicates the
PCM commanded value. In closed loop, 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.