It's just not likely to last as long. No big deal, from my reading.

If it is a non-Honda sensor, I wouldn't sweat it at this point.

Contrary to what the other poster said, IMO replacing the O2 sensor is not
at all necessarily a waste of money when you get a code for same. I do agree
it's kinda early for an oxygen sensor to die, at 77k miles and six years on
your 2000 Civic. It's also possible other things may be behind the code. We
just don't know yet. If the code returns, then go to a different shop,
preferably an independent import car shop. Tell them the code is back, etc.

Try to pay attention to your car for other symptoms. Like poor gas mileage,
or running rough. Are you following the maintenance schedule for the car,
and using OEM parts for plugs, ignition wires, cap and distributor? Making
sure the air filter and fuel filter are changed as recommended? Dumping a
bottle of Chevron Techron into the fuel tank a few weeks before the next oil
change? (That last one is something a lot of us here do, but whether it make
a difference or not is not clear. Our old cars keep running, though!)

Elle
Original owner, 1991 Civic LX, 174k miles.

> wrote
> So should I assume I didn't get a Honda O2 sensor? What is the danger
> of using an aftermarket O2 sensor?
>