Honda accord 1998 ex v6 p0141?

So the 1st code I had was p0420 which was dealing with the catalytic converter. But I knew that wasn't bad because I wasn't seeing of a failed cat. So I replaced the downstream 02 sensor due to horrible gas mileage.(The sensor was like a rusty black it needed to be placed As soon as possible ) so when I start the car up e raised the check engine light and no more than 3 seconds later it comes back on and now it's p0141. So I've been researching it said it might be a fuse but I've checked that no blown fuse anywhere, they said it could be s short in the wiring which brings me here. I think the sensor might be faulty… Please help

Easy enough to test. Look for power and ground on the black yellow
black white wires. Fuse is 15A #6 in driver's under dash fuse box.