One problem related to emission control 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.
Vehicle has thrown an engine code due to excess oil consumption due to sticky piston rings, advancement in timing and vvt advancements. Due to this engine code being thrown, the car deactivates vsa and also throws an emission control light. This causes the car to enter a state where it advances the rpm's at idle by a significant amount and burns more fuel. When leaving the car in drive but at a stop, the car will quickly accelerate nearly to 30 mph on a flat surface. In order to stop the car, the driver must excessively engage the brakes. Acura technicians have informed me that this is a known issue and is due to the piston seals being faulty, causing excessive oil consumption and loosing the timing chain to become out of sync. Engine will then enter a "limp" mode where car will idle higher, burn more fuel.