Maybe I'm misreading what your statement was, you mentioned that the OBD monitoring was disabled, did you mean specifically throwing engine codes?Sorry, I don't understand your reply to what I was saying
A scan gauge requires OBDII monitoring in order to give any sort of readout, I have a staged ECU and a scan gauge, and they both work together, giving something like 32 different monitoring options.
I did a stage 1 ECU and turboback exhaust with cat delete/lower O2 sensor delete all at the same time, I received ONE engine code, the ECU let me know that it was not receiving a reading on the lower O2 sensor, I think it was P0131-O2 sensor voltage being low, and once it threw the code one time it never came back. Basically it's the "Hey, this isn't working, letting you know this one time, just in case you didn't mean to do this" sort of warning.
But that's not from the primary O2 sensor, I'm almost positive the stage 1 only removes the input from the secondary, meaning a problem with the primary 02 sensor will still throw an engine code that the stage 1 will read.
So perhaps you meant that just certain parameters related specifically to emissions are ignored?