A potentially defective turbine wheel in the turbochargers of 2011 and 2012 Porsche Panamera Turbo and Turbo S models and the 2012 Porsche Cayenne Turbo has led to a recall. There are 270 units affected among the three models, with a casting defect being cited as the cause of the trouble. The issue could lead to a fracture in the turbocharger itself, which could then lead to follow-on problems, smoke and risk of fire.

Porsche is notifying owners this month, after whcih they can take their cars to their dealers for repair free of charge. A complete notice from the National Highway Traffic Safety Administration is below.
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Report Date: July 17, 2012 at 03:39 PM
NHTSA Campaign ID number: 12V329000

Vehicle Make / Model: 2012 PORSCHE CAYENNE, 2011 PORSCHE PANAMERA, 2012 PORSCHE PANAMERA
Manufacturer: PORSCHE CARS NORTH AMERICA, INC.
Mfr's Report Date: JUL 11, 2012

Component: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO-CHARGER
Potential Number of Units Affected: 270

Summary:
PORSCHE IS RECALLING CERTAIN MODEL YEAR 2011-2012 PANAMERA TURBO, 2012 PANAMERA TURBO S, AND 2012 CAYENNE TURBO VEHICLES. THE TURBINE WHEEL OF A TURBOCHARGER MAY FRACTURE DUE TO A CASTING DEFECT. IF A FRACTURE OCCURS, VEHICLE PERFORMANCE WILL BE DECREASED AND THE TURBINE SHAFT MAY FRACTURE.

Consequence:
IF THE SHAFT FRACTURES, OIL MAY BE DRAWN INTO THE EXHAUST SYSTEM, RESULTING IN SMOKE AND THE INCREASED RISK OF A FIRE.

Remedy:
PORSCHE WILL NOTIFY OWNERS, AND DEALERS WILL REPLACE THE TURBINE WHEELS, FREE OF CHARGE. THE RECALL IS EXPECTED TO BEGIN IN JULY 2012. OWNERS MAY CONTACT PORSCHE AT 1-800-767-7243.

Notes:
PORSCHE'S SAFETY RECALL NUMBER IS AC04. CUSTOMERS MAY CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY: 1-800-424-9153); OR GO TO HTTP://WWW.SAFERCAR.GOV.