P0352 2004 Toyota Highlander -

Question

I get a po304 code, I switched the #4 coil pack with the #2 coil pack to see if the coil pack was bad. I still get a #4 cly missfie and a po352 code now. Could this be that the po304 code is still in the computer?

Answer 1

Its possible if you did not erase the code. See steps below to check the coil connector.  

if you have 9 to 14v with the key on the coil connector, I would also replace the spark plug in cyclinder 2 if swaping coils does not work. Use the factory number spark plugs don't use cheap spark plugs.
If the problem is still there the harness and ECM will have to be checked.