how to tell if O2 sensor is bad
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Registered User
Joined: Mar 2002
Posts: 811
From: tallahassee, FL
how to tell if O2 sensor is bad
I just pulled my header and checked the 02 sensor (damn blown head gasket
). How can you tell if it is good? I had an exhaust leak I didn't know about on that side and the back of the o2 (faceing the muffler) is carbon covered while the front (facing front of car) is white. Is that normal?
). How can you tell if it is good? I had an exhaust leak I didn't know about on that side and the back of the o2 (faceing the muffler) is carbon covered while the front (facing front of car) is white. Is that normal?
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Joined: Dec 1969
Posts: 4,950
From: San Diego, CA
A scan tool such as Diacom can be used to verify the O2's. The sensor should cycle rapidly between 100 and 900 mV. Dead sensors will read a constant 450 mv; worn sensors will slowly cycle. If you have 50K+ miles on them, I'd suggest you just replace them. As they "wear", they cause you to burn rich and eat gas mileage.
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