Sonata spark plugs - Cars & Trucks

Remove the coils that are over the spark plugs and then you can access the plugs

I hope there is a better design on these sonatas with a v-6 as far as being able to replace spark plugs than having to remove the intake. that is some b.s.

I'd take a spark plug out...connect its plug wire to it...lay the plug on something metal and crank engine while watching spark gap and see if you have a nice spark.
Thats the easiest test...

Hope this helps...

remove the plastic cover that bolts to the top of the valve cover. The plugs will be under there.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Yes, the timing belt, spark plugs and spark plug wires, fuel filter, O2 sensor/s, a transmission service too.

you would need a 10 mm wrench and 5/8 socket for the spark plugs,
dissasemble the coils if you have coil on plug with the 10 mm wrench if its cable on plug unplug the cable and spray some wd-40 on the spark plug hole, then take the plugs off with the 5/8 socket

I posted this solution for this same engine on the 2001 Kia Optima. It is Exactly the same 2.5 V6, and the instructions are exactly the same. I recommend replacing the plug wires. Please see 2001 kia Optima for the rest. Good luck, it's fairly easy.

You didn't specify whether you have the (4) cylinder or the (6) cylinder engine..... I have a 2004 Hyundai Sonata 2.4L 4 cylinder and I just changed the spark plugs in it. I believe that the 2005 2.4L engine is the same. To locate and change the (4) spark plugs on a 2004 Hyundai 2.4L 4 cylinder engine: Remove the (4) 12mm bolts from the decorative plastic engine cover. Remove plastic cover from engine and place it off to the side out of your way. Standing in front of the car, the (4) spark plugs are located laterally (left to right) in the recessed area underneath where the plastic engine cover was removed. Note: This engine has (2) coils....They are located above spark plugs number (2) and (3) from left to right. Starting with the fist spark plug on the left: Remove the spark plug cable by pulling straight up on the insulated connector. Using a spark plug socket, remove the old spark plug and install a new one in it's place. To access the second spark plug from the left, remove the electrical connector and the spark plug cable wire from coil number (1) and then remove the (2) 12mm bolts that secure the coil to the engine. Spark plug number (2) is located directly under the coil. Lift the coil straight up removing the insulated connector from spark plug number (2). Using a spark plug socket, remove old spark and install a new one in it's place. Repeat same procedures for spark plugs number (3) and (4). Note: If you have the (6) cylinder engine, the front (3) sparks pluge are readilly accessible but in order to access the (3) rear spark plugs, you will have to remove the intake manifold

They are directly below the coil packs (10mm bolts).

You change One spark plug, and One wire at a time. Do you know where your timing belt is? If not, its on either the right or left side of the engine. There is a covor to the timing belt. You take the First plug that is closest to that belt. Then you work your way to the next closest all the way to the last one. Remember, you have to do ONE at a time.