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Old 08-11-2011, 11:56 AM   #8
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Join Date: Apr 2009
Location: SF Bay Area
Posts: 247
Originally Posted by JFP in PA
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?
+1 on this.

This is the exact experience I had last week after flashing my ECU back to stock (from Softronic tune) and clearing a code. 3 systems came up as not ready and they wouldnt let me test, so I'm putting some miles on it now then re-testing soon. Up until that, I didn't know that clearing it would cause it to be untestable.
2003 Cayenne Turbo
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