[JFP in PA]

It is correct, I have the Boxster factory OBDII service manual in front of me, on a 7.2 1128 and 1130 are the same codes for opposite banks which states, "fuel/air mixture is so rich that sensing is up to its limits attempting to lean it out", with probable faults of a leaking injector or fuel pressure being too high. The same two codes on a 5.2.2 DME states "fuel/air mixture is so lean that sensing has reached its limits attempting to richen" , with probable faults of an intake leak or low fuel pressure.

Stuff like this is why I caution people about making sure they have all the supplements for Porsche service manuals as the same codes can mean something completely opposite depending upon year, model, DME version, etc.