TheLALienTimes

Hopefully I can be of some help here as I just recently successfully cleared obd codes p1124 p1126 and p0506 from my automatic 99 porsche boxster with about 89k miles on it. I was originally trying to fix the problem myself. I started by replacing all of the o2 sensors and the air filter which did absolutely nothing. The car kept rough idling and doing what I called "ghost revs" where it would just rev up and down on its own even when the car was at a complete stop. I could not find anything wrong with the MAF sensor which seems to be the main cause of this problem, and all of my hoses connected to the air flow seemed to be completely intact. I gave up after working on it for a couple weeks, as I got this car less than a month ago. I took it to my local porsche mechanic and they replaced all the spark plugs and tubes, outer and inner tube seals, orings and oil tubes as well as the vacuum reservoir which cost me 585 dollars including labor and tax. p.s. ( also had air leak coming from a cracked oil fill tube which I didn't see due to the tight space in the engine bay, and my aftermarket glass window top also makes it even more difficult to get in there) With those fixes, the codes p1124 and p1126 disappeared. But, after a few days of driving the car started doing the "ghost revs" again and a new code popped up p0506 "idle air control system RPM lower than expected." I took the car back to the shop and had them look at it. Took them all of 45 minutes to see it was the idle air control valve that was all gunked up with carbon build up and dirt and the little door that opens and closes on it wasn't operating properly. He cleaned it up for me while I was there, no charge, and now my porsche is running as smooth as ever. I ran my reader on it and no new codes have popped up. Hope this helps, Jason