One problem related to tire sidewall has been reported for the 2009 Acura TSX. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Acura TSX based on all problems reported for the 2009 TSX.
I have had two michelin pilot hxmxm4 size 225r17 93v tires fail on my 2009 Acura Tsx, these were the original tires. Both tires had breaks in the sidewalls with a "w" pattern. I found these defects on one tire which only had 1700 miles on it, the second tire failed with 7400 miles on it.