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Ask Sebastian Vizcarra Your Own Question
Sebastian Vizcarra
Sebastian Vizcarra, Porsche Meister Tech
Category: Porsche
Satisfied Customers: 350
Experience:  Porsche Factory Certified Master Technician
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Have an issue with my 2011 Cayenne S, has 70K miles on it.

Customer Question

Have an issue with my 2011 Cayenne S, has 70K miles on it. Sometimes I start the car and it idles rough, when i start to drive it, i can tell there is loss of power. Shortly after it starts idling rough, the Check Engine light comes on, PSM failure light, and Start/Stop Disable light. This will usually last for a few mile and then runs fine, and only the CEL stays on. The other two warning light would go off. After a few short trips around town and no rough idling, the CEL would shut off too.
This used to happen about once every 3 weeks, now its happening daily. The CEL does not go off at all and the rough idling and the two other warning lights come and go daily.
I had it scanned at the shop and it shows Cylinder 2 misfire.
I also had the Gas Gauge malfunction light come and go off a couple of time, but that did not seem to coincide with these other problems.
Any idea what this could be?
Submitted: 3 months ago.
Category: Porsche
Expert:  Robin Everett replied 3 months ago.

Is this the only coded they pulled period? also does the vehicle smoke at all upon running rough and or start up?

Customer: replied 3 months ago.
Yeah, this is all that came up on their reader. There is no smoke at all. I now have a reader myself, its a INNOVA 3160b. I checked the codes this morning using the INNOVA and all that came up was P0302 Cylinder 2 Misfire Detected, just like the shop had told me.
About 3 hours ago I swapped ignition coils between cylinder 1 and 2 and erased the check engine light using the code scanner. (Want to see if maybe its the coil going bad on cylinder 2.) I drove for about 15 miles after that and the car drove perfect, no rough idle, no warning light. Im sure it will come back though.