Good Evening,
If I unplug an O2 sensor and then check to see if the O2 heater circuit is not functioning (via my Foxwell scanner), will that identify which O2 sensor that would be?

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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,