P1126, CEL and Vacuum Leaks

[ekename]

:help:

Last week my car showed a CEL and the resulting code was p1126 indicating that the engine rich threshold on cylinder 4-6 had been reached. I had the code cleared and about 50 miles later it came back. I popped the engine cover while the engine was running and I can hear, very clearly, an unsual sucking noise which leads me to suspect a vacuum leak. Any ideas on how to diagnose / correct this issue. Am I better off just taking it up to the dealer / reputable Porsche repair guy? Any suggestions are appreciated.

Also, is it okay to drive the car or should I wait until this is corrected? I've driven it very little since this occured but the car seems to run fine with no hesitation through all gears.

Thanks for the help!

Tim

[Loren]

If you are only getting a P1126 then theat would indicate the problem is on the cylinder 4-6 side (passenger side on a Carrera).