Reset check engine light

[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?