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For CU2 Acura TSX Owners Looking to Find their ECU Location or to find Codes For Hondata Chip Tuning Upgrades etc..Flashpro..
On all my other Hondas, It's inside the Vehicle Cabin [Where you sit/Passenger Lower Front Area]
On the CU2 Acura TSX 4cyl with a K24 Engine. SMS5 Transmission [Manual] it is located in the engine bay, Right Behind the battery with a little plastic cover that is removed with your hands, Just kind of lift the top, and pull.
On the back you'll see a sticker which should have your ECU Code. Plug this into Hondata ECU Product Finder or your other tuning options, and see what's available for you. Took me a bit to find this, figured I would share.
Many people see upto 30hp freed up just from this upgrade on stock motors. Can even lower VTEC engagement point. Check it out.