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<div class="moz-cite-prefix">On 06/12/2013 10:50 AM, Michael H.
Warfield wrote:<br>
</div>
<blockquote cite="mid:1371048611.6220.128.camel@mtking.wittsend.com"
type="cite">
<pre wrap="">I think
you still have to drive a certain number of miles, after resetting a
check light, before you can run an emissions test though, if that's the
reason for your request.</pre>
</blockquote>
<br>
After clearing all trouble codes from the computer, you have to
drive "enough" (vaguely defined; for GM, usually three or so "drive
cycles" per their testing procedure) to ensure that the computer
reports "OBD Readiness". Once the computer reports that it is
verified OBD readiness for all of its supported categories, it can
pass an emissions test. Also, it's possible to have "pending"
codes; for example, P030x is usually a "pending" code until the
event has been detected more than X number of times per Y interval,
to account for the fact that engines can have isolated misfire
events that have no significant meaning and do not have a drastic
effect on emissions (an older engine can easily misfire
occassionally under high load, such as climbing a mountain with a
trailer and a full family...). Pending codes, however, do not
affect OBD Readiness, IIRC, nor do they turn on the MIL.<br>
<br>
— Mike<br>
<br>
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