I agree with vex, I have installed and tuned with several Innovative widebands and never had to repeat the calibration process after the first time(although it is a good idea to do it every once in a while, and can be done while o2 is installed as per vex's instrucitons). Although I have done the UEGO once and I must say I was pretty impresed by the ease of installation and did not really have any issues, but that was only once.
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