Ok, what's the deal? And yes I did search

Hello, just passing thru due to a MIL on my wifes 96 Civic which is completely stock I might add. Anyway from your search function I found out how to get the codes to flash. It's code 41 primary O2 sensor heating circuit or something like that. Then I tried searching again to find out if there a diagnostic steps to determine if the O2 is really malfunctioning but came up with nothing. Are Civics known to set the MIL with anything related to either 02 sensor on higher mileage engines, I don't happen to have a service manual (OEM or after-market) to show proper dianostic steps. The car has about 77K if that matters, it's been well maintained over the years and very reliable. Since we got it new all I've changed are tires, fluids, and regular tune-up stuff. Heck it still has the OEM battery. FYI, I also tried pulling the ECU fuse for a short while to see if the MIL will go away and it didn't. Should I try diagnosing the code 41 or just pop in a new sensor? I have yet to take a closer look at the harness for loose or corroded terminals, so you never know.

Thanks, MIKE