Please look up your vehicle's documentation. I think you have an AFR sensor there (Air Fuel Ratio) sensor. No narrow band oxygen sensor will make that kind of voltage.
Check the voltages of the sensor and the computer ends of the wire with the efie disconnected.
You'll need to read the Range adjustment article again. Get the range set to about .45 volts with the adjustment pot at it's maximum and the efie disconnected from your sensor.
Read the following 2 articles in addition to the Range Adjustment article.
Your first priority is to make sure you actually have an oxygen sensor. Then it will be to get the range set back to a useable value. Then we can go from there.
But no hand holding!!!!