A loud rattle type noise may be noted from the engine after a cold start. This can be caused by a faulty valve timing control actuator. Replacing the failed actuator will commonly correct this noise issue.
Car problem reports
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Most reported 2009 Acura TSX problems
The rear brake pads wore out after 20k miles. There was still plenty of pad left on the front brakes, but it seems they designed the brakes with not enough meat on them for the rear. I've found other complaints of this issue from drivers oh the NHTSA site.
The fuel door may not open correctly at times. This may be caused by a lack of clearance between the fuel door and the release latch. The common repair is to slightly trim the top of the fuel door lock tap.
The hood may flutter or vibrate at freeway speeds. Acura has made a revised rear hood seal available which should eliminate this problem.