Just thought that I'd let people know that a recall has been issued for the M56.  You can find the details at Infinitihelp.com or contact your dealer directly and reference ITB10-040.
				
			ITB10-040 Recall
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A new entry has been added to Knowledgebase, category 2011 M
Description: 2011 INFINITI M56; VOLUNTARY SERVICE CAMPAIGN AIR FUEL RATIO SENSOR
Due to a software irregularity on certain model year 2011 M56 vehicles, the Engine Control Module (ECM) may incorrectly store a Diagnostic Trouble Code (DTC P0133 and/or P0153) for the Air Fuel Ratio Sensor and turn ON the Service Engine Soon light on the instrument panel. To remedy this potential condition, Infiniti is conducting this voluntary service campaign to reprogram the Engine Control Module (ECM) at no charge for parts or labor.