Hey guys, my 09 TSX is throwing a misfire code for cylinders 3 and 4. P0304 and P0303. I thought it was a bad coil so i replaced cylinder 4 with a new one. (driver side). Cleared the code and drove about 100 miles and CEL came back on with same code P0304 along with VSA error "Check Emission System" All the plugs were replaced with OEM about 10k miles ago.
Now i'm beginning to wonder the order of the cylinders. I found a few diagrams showing the order as 1234 (passenger to driver) and some say its 4321 (passenger to driver) Anyone know the real order of the cylinders. Its the 2.4L 4cyl engine. 2009 TSX
Just thought i would reach out before i end up replacing all the coils.
Thanks!

 

instead of replacing the coils, you can troubleshoot them.
with the engine running, unclip coil harness one by one.. engine note should change. if engine note doesnt change, that's your suspect coil.