An interesting observation.

[derfo]

The other day my CEL light came on. I found one of the O2 sensors loose on the rear nearside cat (UK). After tightening this up the light was still on as I new it would be from passed experience. Because I have still not got a code reader, I thought I would do what I did last time, disconnect the battery to remove the CEL light. The fact is I have been too busy to do this at the moment, so I just left it. Today, about 5 days since it came on, the CEL light has gone of its own free will. I just wondered if this is normal? and will the code still be stored in the system to read when I finally get my Durametric? Boxster 2002 S 85,000 miles.

[JFP in PA]

When the problem that set off the emissions code is fixed, eventually the DME will reset and clear the code and the check engine light; this is completely normal.

[derfo]

Originally Posted by JFP in PA

When the problem that set off the emissions code is fixed, eventually the DME will reset and clear the code and the check engine light; this is completely normal.

Thanks JPF, good to know that.