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#1
03-24-2010, 02:46 PM
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94 Ranger, failed smog problem code 411
Recently I took my Ranger to be smogged and it failed miserably. I had a very high NO levels. I ran the codes and came up with 411 and 172 the first time I ran it. Since then 172 has gone away.
I was thinking I would do a tune up first and then try to get the 411 code to go away and then retest and see where I stand. Should I replace the IAC valve? Also, I would really appreciate any other ideas on what may be causing the high NO levels. Thanks 
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