Replacing Spark Plugs and Tune-Up

First, note that accessing the spark plugs is not straightforward; you will need to remove the components listed below, and it is recommended to perform this operation with the engine cold. Once you open the hood and ensure it is securely supported, detach the plastic engine cover and remove it.
Remove the stabilizer bar mounting bolts using a 19mm socket (the ones at both ends, on the shock absorber support mounts, and the central ones connecting to the damper or silent block) and take it out.
Next, you need to remove the plastic intake manifold by first loosening the clamps connecting it to the two front flexible hoses and then those connecting it to the rear aluminum ducts; using a 25 Torx wrench, unscrew the mounting screw located near the exhaust manifold and then remove the plastic manifold, disconnecting any other small tubes present.
Finally, remove the screws (25 Torx) securing the cover on the engine block, then the timing belt cover: at this point, you can access the spark plugs.
Pull the spark plug boot straight up (it is press-fitted) and unscrew the old spark plug with the appropriate wrench. Before installing the new spark plug, apply anti-seize lubricant to the threaded part, which can be easily found at any auto parts store, and install it with the correct torque to ensure optimal operation.
It is suggested to replace the spark plugs one at a time. After completing the replacement, proceed in reverse order for reassembly.