[rbogh901]

How can one interpret the oxygen sensor reading on a 3.6 to determine if you are running rich or lean?

My understanding is the following:

A rich mixture has less oxygen so the voltage signal is high in the range of .6 up to 1.0 volts.

A lean mixture has more oxygen so the voltage signal is low in the range of .4 down to .1 volts.


With low exhaust oxygen content, we will have high oxygen sensor output which will show as something above .45volts which indicates a rich running condition.

With high exhaust oxygen content, we will have low oxygen sensor output which will show as something below .45 volts which indicates a lead running condition.

From the oxygen content, and the resulting signals, the ECM can determine if the air/fuel ratio is rich or lean and it adjusts the fuel mixture accordingly...