[Diy_efi] WBO2 and AFR

[Adam Wade]

--- "Fehn, Ron G" <RFEHN at amfam.com> wrote:

> now i just read that 02 sensors, both NB ad WB, do
> not read A/F ratios!  instead they read lambda or
> stoich for that type fuel.

Neither is correct.  They read partial pressure of
oxygen in the exhaust.  Basically, they are reading
how much oxygen is near the sensor at any point in
time.  If the same amount of oxygen is there,
regardless of fuel, the reading will be the same.  So
they do not read lambda for all fuels; NBO2 sensors
center at lambda=1 for gasoline, but not for anything
else (AFAIK).

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