What is likely happening is that the LC-1 (black box that connects to the O2 sensor) has somehow changed from gasoline to a custom setting (it can be setup to read A/F for methanol, propane, etc). The only way to change it back to the gasoline setting is to connect the LC-1 to a computer running their LMConfig program with their serial cable plugged into the LC-1 (most computer don't have serial ports anymore so you will need a USB to serial adapter). It will probably show it is set to "Custom" so you need to set it back to "gasoline".
There has been some discussion about this on Innovate's website forum. One theory of how this gets messed up is that if you partially unplug one of the stereo connectors when the LC1 is on, it can go from transmit to receive mode which will cause it to get reconfigured.
We have been cutting off the stereo plugs and hardwiring them - but be aware that the wire colors can sometimes be different between the 2 cables you are splicing together. If I remember right, you could see red,black,green on one side and red,black,white on the other. You need to connect red to red, but instead of black to black, black goes to white and green goes to black.