Quote:
Originally Posted by bwdz
I'm surprised you don't get the old P0420 code with the secondary reading basically nothing. Supposedly the secondaries don't affect the air/fuel but I am speculating that they do in the long term if it sees something it doesn't like for extended periods of time. You should be steadier on the second 02 and closer to .5v but it should still bounce around the .4 to .65 range.
|
now that i think about it.. a few months ago i got the P0420 code, i reset and it never came back so i assumed the cat is fine. i never checked the O2 sensor though.