Quote:
Originally Posted by mpg_numbers_guy
How bad would they be? Would it be possible for it to go bad and still get these MPGs by hypermiling, but get even better after replacing/cleaning?
RPMs are consistently dropping out of "warm up mode" at an engine coolant temp of 71C.
Would it be possible for something to throw the error without it existing? I reset it a while back and it returned about 5-10 seconds after starting my car.
EDIT: and is it possible to ruin the O2 sensor by cleaning it?
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I think whether cleaning ruins o2 sensors is a matter of how you do it. Do what others have done with success and take it easy and it should be fine. I think if you have an intermittent failure it will come back, sooner or later, sometimes sooner, sometimes later. I do think CELs can get set off in error. It is just voltage fluctuations that communicate the messages to the ECU. I think old machines learn new tricks.
I got my P0420 again tonight, despite cleaning the sensors the other day. My next move is clean the CAT itself, since I now can eliminate the O2 sensor as the source. Science!