ConnClark,
Wideband oxygen sensor will always be operating in excessive lean
conditions, or even in pure air. It is designed like this. Don't worry.
To pass smog check, just switch OFF DCD control, then everything will go
back to it was when DCD has not yet been installed. You may also choose
to physically remove it by reversed "plug and play". DCD Controller can be
bypassed in seconds from its circuit.
Here we may introduce a new term to reflect the feature of DCD Controller
----- “unplug-and-noplay".