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Old 06-15-2011, 10:05 AM   #4
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,123
Quote:
Originally Posted by jhandy
in the parking lot of the station, I would unplug the battery or clear all codes. Then they hook it up, and hopefully it wil not throw codes before they test it.
That is exactly the wrong thing to do; the EPA has built a trap into the DME that leaves several critical emissions sensors “not ready” for several drive cycles after disconnecting the power. This was done on purpose to prevent any OBD II compliant car from having any codes cleared just before inspection. Do it and the car will fail, and then the codes will come back.

Why not just find out what the codes are and fix it?
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