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Exhaust O2 sensor plug issue

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New User

Aug 4, 2020, 3:40 PM

Post #1 of 2 (696 views)
Exhaust O2 sensor plug issue Sign In

I recently replaced a catalytic converter on my 20 year old car.

The new converter had 3 O2 sensor ports one with a metal plug, my car only uses 2. After the repair the plugged port factory installed plug was ejected on the highway after about 10 miles. So I replaced the plug tightly with a same dimensioned oil pan plug from AutoZone and used thread locker. The 2nd plug was ejected after about 50 miles.

How do I keep that thing in?

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 4, 2020, 4:50 PM

Post #2 of 2 (692 views)
Re: Exhaust O2 sensor plug issue Sign In

You can use an oil drain plug for that. That is a high temp situation and requires a special plug. I have never seen one come out on it's own so it must have been left loose in the first place. If you go to a muffler shop they should have a bunch laying around from previous installations.


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