20 Oct 11 16:54, Mark Hofmann wrote to Roy Witt:   
      
      
      
    RW>> If you have a scanner that clears the codes, they can't tell if   
    RW>> there was a code in the computer. If you disconnect the battery,   
    RW>> there's still a history of the code in there, but no CEL. I have an   
    RW>> HP Tuner, which can clear codes as well as re-write most of the   
    RW>> look-up stuff that's in there.   
      
    MH> Yes, my scanner and computer program can both clear the codes.  The   
    MH> issue is that it "resets" the tests.  At least it did on my   
    MH> daughter's Cougar. The catalyst tests (I believe there are three of   
    MH> them).  The last test takes several days to complete after a reset or   
    MH> clear.   
      
    MH> If you take it to emissions after a clearing the code, the computer   
    MH> re-starts the tests again.  They can tell at the emissions station   
    MH> that the tests have not completed - so it shows to be "not ready" for   
    MH> testing.  They don't fail you, they just tell you to come back in a   
    MH> week.   
      
   Wow. I'm sure glad we don't have any of that mess to go through here. I   
   wonder if California is that tough.   
      
      
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