What should the o2 sensor readings be...
#1
Junior Member
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What should the o2 sensor readings be...
Hello, Was wondering what the upstream and down stream o2 sensor readings should be reading on my scanner?
I have a 2002 Grand Prix GT 3.8L
I can't see to find that information on line, or my wording is not catching that.
Any help on what they should be, thank you.
Joanne
I have a 2002 Grand Prix GT 3.8L
I can't see to find that information on line, or my wording is not catching that.
Any help on what they should be, thank you.
Joanne
#2
Senior Member
The pre O2 should be constantly changing above/below 450mv.......the post O2 sensor should almost be flatlined, or changing very slowly(this depends on when the catalyst stores/uses oxygen).....
When the post "mirrors" the pre, in other words, rapidly changes in unison with each other, then a P0420 is set....this is usually an indication of a bad cat.....
red is the pre, green is the post
When the post "mirrors" the pre, in other words, rapidly changes in unison with each other, then a P0420 is set....this is usually an indication of a bad cat.....
red is the pre, green is the post
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Derek_64
1992-1999
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11-29-2005 03:51 PM