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Pappnese -
My car does the same thing. I know this because I have a digital Air/Fuel Ratio gauge. I can "see" the 02 sensor go lean, but the scangauge is still reporting closed-loop.
My theory is that this behavior is OBDII compliant. The ECU/PCM initiated fuel cutoff and continues to report closed-loop operation because it is in full control, aka it knows *why* the 02 sensor is reporting a lean condition and that's ok. In fact, it's good because it's proof that the DFCO is functioning.
If you think about it, the other sensors might report values that are also tainted by DFCO, so why go into open-loop at all?
CarloSW2
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