So basically, if I understand this entire deal...

The Bosch chip outputs a voltage called Vcj and this voltage allows you to calculate IP.

IP = (Vcj -1.5) / 1.053 This works fine!

Now that you know the IP, you must do a lookup using the values that Bosch provided in the lookup table for IP vrs. 02%

Cool, now how in the world do you make their Math work on Xo2 to Lambda?

They have a formula stating...

Lambda = (Xo2 / 3 + 1) / ( 1 - 4.76 * X02)

Then they show the following as references....

IP = 1.40 = 12.0% Xo2 = 2.42 Lambda

IP of 1.40 = 12.0% Xo2 (This works fine)
IP of 1.40 = 2.42 Lambda <- Does not work

This does not work given the above formula using 12.0% Xo2 or I'm doing Math Wrong.

Lambda = (Xo2 / 3 + 1) / ( 1 - 4.76 * X02)

X02 = 12.0
12.0 / 3 = 4 + 1 = 5
12.0 * 4.76 = 57.12
5 / (1 - 57.12) = 5 / -56.12 = -0.089

Where am I going wrong?