Reset check engine light

[blue62]

Originally Posted by sfkjeld

My 2000 2.7 Boxster will throw a 1341 CEL after 30-50miles. Cam adjustment below limit. It’s been an issue for 5 years. The car runs great tho.

I’ve been taking the car to a shop that uses the Porsche diagnostic tool to do a full CEL reset and they then take the car to have it smogged. $200. I’ve done it twice.

Now the twist. I had the car in storage for the winter and the battery died. The car’s been been without power for a few months. I installed a new battery today and the car started fine. With NO CEL! It was on when I parked it last fall.

Question: does disconnecting the battery completely clear the diagnostic codes?

If you disconnect the battery long enough the DME/ECU looses all memory and then resets to factory defaults when you reconnect a battery.

[JFP in PA]

Originally Posted by blue62

If you disconnect the battery long enough the DME/ECU looses all memory and then resets to factory defaults when you reconnect a battery.

And it also triggers an internal I/M Readiness protocol that pulls several emissions related sensors offline until the car has been drive a certain distance after reconnecting the battery. Because of this, the car will not pass emissions testing until the sensor registers reset to active or "ready". The EPA requires this protocol be in all internal combustion vehicles to prevent someone from disconnecting the battery just prior to going in for emissions........................

[sfkjeld]

Originally Posted by JFP in PA

And it also triggers an internal I/M Readiness protocol that pulls several emissions related sensors offline until the car has been drive a certain distance after reconnecting the battery. Because of this, the car will not pass emissions testing until the sensor registers reset to active or "ready". The EPA requires this protocol be in all internal combustion vehicles to prevent someone from disconnecting the battery just prior to going in for emissions........................

Thank you JFP, yeah it seemed to good to be true. So the question is, how is the shop doing it? Is this something that can be be done with a high end Durametric tool where they can clear specific codes in a way undetectable by smog testing equipment?