Hey, nobody has claimed it yet so just let me know. Here is the copy and paste from the manual about the free air calibration. I had the red push button installed and wired up to make it easy and its included in the kit as well. Its not as complicated as the manual makes it sound (the lc-1 should already be hooked up to a 12v source) and realistically it should* allow the sensor to be more accurate even after it deteriorates over time... at least that's the idea i guess.
4.1 Free air calibration
To achieve maximum precision, the LC-1 and its sensor needs to be recalibrated frequently.
The sensor MUST be operated in free air for calibration.
Remove the oxygen sensor from the exhaust and expose it to free air (outside of the exhaust
pipe) for calibration purposes:
1. Connect the LC-1 to 12V from the vehicle and switch it on.
2. After the sensor has warmed up, either press the pushbutton or connect the calibration wire
to ground for three seconds and release.
3. After the calibration is complete, switch the LC-1 off and wait for 30 seconds before you start
the car.
If a LED indicator is connected to the calibration wire, it will be off during free air calibration.
