Hmm, I think I got it now but i'm kind of frustrated because I didn't notice it earlier...

P0135 41 Front Heated Oxygen Sensor Heater Circuit Fault (Sensor 1).
P0141 65 Secondary Heated Oxygen Sensor Heater Circuit Fault (Sensor 2).

I was confusing a P0141 with a code 41, that's probably why huh? Well would I have any drawbacks driving with a malfunctioning heater circuit in my secondary sensor since it doesn't control the A/F mixtures? At least my gas mileage is back up, maybe the primary was going out?