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As long as the intake valve is closed IMO the O2 sensor will work ok . Cause even if you left exhaust valves open there no new air coming in (intake closed) . There maybe some reversal/turbulence depending on how you handle exhaust valve . As I posted before Honda says they close both valves to reduce pumping losses but while there no new intake change to compress there is still some back an forth compression/vacuum going on IMO .
Haven't look to see how other manufactures do it .
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