Quote:

I have read where these A/F kit O2 sensors can go bad. What would cause one to go bad early?

If these are plugged in all of the time, how can we keep these working properly on our old cars that do not get used as daily drivers?

Thanks



Several things..
1. Repairs that have used silicone gasket sealer
that is not specifically labeled "Oxygen sensor safe".
2. Leaded fuel will ruin the O2 sensor in a short time.
3. Car is running rich over a long period, the
sensor may become plugged up.
4. O2 sensor coming in contact with undercoating, antifreeze or oil on the outside surface of the sensor can kill it.

Just my $0.02...