I've honestly used it on more cars than I can remember and only once had that o2 sensor problem. I got a little over zealous pouring it in my old Hyundai... My instructor in trade school (1999) was a GM master tech and they swore by "GM top engine cleaner" which he claims was made by the seafoam people and they actually added it right through the brake booster vacuum. At the time it was almost impossible to find. Napa was one of the only places that carried it but its really caught on cause it honestly does work. You should see the cloud of burnt carbon that comes out of some vechicles.
When I worked for Honda we used wellfleet or well something I can't recall exactly what it was called but it's almost the same stuff we just used one of those drip devices. We got 79.99 for the job if the service advisor was able to sell it when we recommended it. Talk about gravy money.