This is a DIY for a 9th gen Corolla 1zz Motor
These plugs DO NOT have to be gapped but it is good to check it out .40
The top photo shows OEM plugs for 1zz or 2zz motor
Remove the engine top cover
You will have to remove the rail for the coil packs - then you can remove the coils in order by either marking them or laying them down in order - You can mix the coils up but why
Always check your spark plugs to see if they are running correctly - Make sure you purchased the right one either Denso or NGK all others NOT RECOMMENDED
By using Dielectric ad Anti Seize to ensure for future replacements it can be easier .
for more information - www.COROLLACARCLUB.proboards.com