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To some degree, you are peeing into the wind here. Disconnecting the battery will clear most, but not necessarily all codes. While it will clear most emissions related codes, but if the problems are not repaired, the codes will re-trigger in a “pending” format waiting to see if the trouble persists.
Automatic clearing takes place if the code source is removed and does not return (e.g.: the car is repaired); but is dependent upon the number of cycles (cold start, full warm up, drive at speed, full cool down) more so than mileage.
This technology was instituted to prevent dumping the codes just before going to inspection; as you have found out, it works. Have the car scanned for codes, and fix the problem(s).
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
Last edited by JFP in PA; 04-05-2011 at 02:31 PM.
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