Quote:
Originally Posted by jimmylomax
... do you think the times the code came back may have been longer stints without EOC? I ask because sometime this summer, I got a P0420 in the Fit on a long commute where I left the AC running for a passenger. I cleared it and it has since come back a couple times when I went longer than about 15m between EOCs.
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I don't think it was the EOC as much as perhaps burning a little oil through the valve guides and/or oil control rings. In EOC maybe the leakage does not have as severe an affect on the CAT's efficiency as when the engine goes constantly for 30 mins and more. My second recurrance was under high load climbing a mountain pass into the high desert, so... pretty hot and probably oil burning?
Quote:
Originally Posted by jimmylomax
Did you run an OBDII scanner and look at the O2 sensor data or measure pre and post cat temperatures? (I've got 30 days to make mine happy to pass my local DOT inspection).
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My 1998 Honda has no CAT temp sensors. Wish it did. Some things remain a mystery to me...
You are going to "
boil your CAT in acid?"