DTC code sez Oxygen Sensor Heater Circuit (Bank 1, Sensor 1). I have '01 Tundra SR5 4x4 and just rolled to 100k. I thought it was maybe some coincidence with Toyota telling me I should do some kind of 100k maint.
Anyway, is this something me, myself and I can fix? I do small stuff but wouldn't take on a tranny for example, so I'm not afraid to loosen a few nuts and drop a new part in if that's what it takes. Where to get it, what to buy, how hard is this to correct?