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... it's not the amount of miles driven, the vehicle has to complete it's drive cycle after the computer has been reset, if it hasn't done that it will fail inspection ...
Resetting an internal I/M monitor can require as many as 40 drives cycles and several weeks of driving to reset. However, I/M monitors that require many drive cycles to reset are often waived when determining an emissions pass/fail.
Worth mentioning that some cars have a rather peculiar "drive cycle" - one can Google "Drive Cycle 08 Porsche" or whatever you are working on - you can't just drive the car normally and accomplish a "drive cycle" - frequently you would have to do this in a rural area or do it in the wee hours of the morning if you live somewhere like LA - cold start, idle a bit but not too much, drive off slow for a certain amount of time, coast at 0% throttle but not touch the brakes, accelerate at 50% throttle to 60% throttle for 5 to 8 seconds, then coast down, not touching brake or (as applicable) clutch...you need a fairly open road to do this.
That is why it may take several weeks of normal driving to reset the OBD Readiness Codes.
Below is the 12-minute drive cycle required to reset all of the I/M monitors to Ready Status for VW/Audi (2009).
To reset my 2005 Honda Accord would require some driving I would only attempt at 3:00 am on the interstates around Chicago, and even then it would not surprise me to be asked to take a breath analyzer test. I always opt for the multi-week reset procedure. But as I stated before, one won't fail the emissions test in Illinois if some of the I/M monitors are in the Unready State. (Provided the MIL icon is off, of course.)
When the CEL came on on my 02 Ford Explorer we found out it was a faulty gas cap. Replaced it, problem solved.
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