[2000SoCalBoxsterS]

Originally Posted by skip_168

once again another code definition..

and yes, a vacuum leak can cause the same codes.. on the list of things to check, vacuum leaks are first...

and actually the DME has much more diagnostic info available than you get to see. The car manufacturers are required to follow the OBDII code protocal & comunication standard if they want to sell cars in the US, but they dont put all the info in there..

you need to have the Porsche diagnostic tools, (which are propietary to Porsche), to see all the info there is..

Of course I haven't worked with car stuff since 2000, so alot could have changed since then...

Topless, according to my Bentley's service manual the codes are the same for the 7.2 DME in this case. From the research I've done in the Tech section of PCA.org the Tech's there point to the MAF or the Oil separator bellows. I also printed out the RennTech code definitions as a backup to my service manual and they are all the same. I was also confused or concerned that it might be the O2 sensors because that's what the P1128 & P1130 CEL codes mention. However, Hayjae made this very good point which is consistent with what the PCA Tech's are saying,

"The O2 sensors are just reporting the symptoms of the problem. Since they are the last sensor, there is so much upstream that could result in a O2 code. Cleaning the MAF may work, but if it doesn't, look for vacuum leaks. A vacuum leak could cause a rich condition. In addition to checking the usual tubing around the motor, check the oil cap, oil filler tube and oil dip stick. If that doesn't work, get a new MAF. It could be the air/oil separator, too."

It seems the consensus opinion from multiple sources is the MAF, Vacuum leak, and air/oil separtors also know as the oil separator bellows.

I did clean the MAF and changed my air filter at the same time. So far after an hour of driving no CEL. But I'll need to drive it some more before I feel confident that the problem has been solved.