First calibrate 1st WBO2 with

* Wideband settings / 2nd WBO2 = disabled

* free air (of course)

Than enable 2nd WBO2 and calibrate "Second" WBO2:

* Wideband settings / 2nd WBO2 = disabled

* free air (of course)

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NOTE (errata):

* if 2nd WBO2 is enabled

* always restart ECU before "Start calibration"

** it was reported that with fw 1.2.31 Dual WBO2 (2nd WBO2=enabled) Tools/WBO2 calibration Stop and reStart calibration after previous attempt and >1 minute: only 2nd heater starts to heat rampup, even if "FIRST" channel is chosen in VT (weird).

** "Start calibration" after ECU reboot => both heaters ramp up

** But recommended to calibrate first WBO2 with 2nd WBO2=(temporarily) disabled, see above.

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If in doubt, check that the wires go to the correct WBO2.

* pump- and +12V are shared, but other signals should be connected to the appropriate nernstinput, pump+ and heater outputs.