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Coils are located under plastic engine cover. You see it as soon as you open your hood. 2 nuts and 2 mclips hold that cover down. Once it is off the coils are right on top of the motor with one 10mm bolt holding each down. Unscrew and pull up on coil being careful not to pull the boot from the coil as it may be a bit stuck on the spark plug.
The spark plugs are under the coils. To get to them you must remove the plastic cowling from the top of the engine. Then you will see the coils, there will be six coils, one for each cylinder each looks the same with an aluminum heat sink on the top. These are removed by removing and the retaining the screw and wires.
Once removed the spark plugs can be access but before you remove the spark plugs make sure the spark plug well is clear of foreign material. Dirt or debris in the spark plug well can fall into the engine and cause damage.
I'm assuming you have the 2.2 Ecotec engine, for they have teh spark plugs hidden under the plastic cap on the engine's valve cover. The plastic cap which should say "2.2 Ecotec" can be removed with 10mm socket, and the valve cover (In case you didn't already know) if the aluminum top piece of the engine. They are a little ways down, so be careful not to cross thread the plug.
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
??? ...the spark plug wires are under a plastic guard. The plugs are lower - follow the wires. The ones at the firewall side of the engine are hard to get to...some suggest tilting the engine to access them easier...I laid on top of the engine and got them out.
The best thing to do is to purchase a Haynes manual for the Toyota Previa. But to access the spark plug wires and spark plugs you will need to remove the passenger front seat. This requires taking out four bolts on the four corners of the seat. After the seat is removed you need to remove the outside seat support and the jack and jack handle that is located under the seat. Next remove the bolt from the seat belt/shoulder harness. Romove the screws from the side of the carpet keeper strip along the bottom of the door. carefully, using a flat blade screwdriver, pry the plastic carpet strip up carefully disengaging it from the rear strip. Unhook the carpet from the edge of the doorway. Pull the carpet back enough to expose the bolts holding the cover over the engine. Remove all the bolts holding the cover over the engine. This will expose the engine head. remove the three bots holding the black plastic cover over the spark plug wires. This wires can be removed allowing access to the plugs. Be aware these engines use only platinum tipped spark plugs. Good Luck
My 2004 Verona had factory installed "NGK BKUR6ETB" regular spark plugs which I replaced at 30,000 miles. The 2005 model year is supposed to have Iridium spark plugs. To replace the spark plugs: 1. Remove plastic top engine cover. 5 nuts 10mm socket. 2. Unplug connector from each ignition coil. qty 6. 3. remove 2 hold down bolts per ignition coil. 10mm socket. 4. remove ignition coil, lifting straight up. 5. Spark plug is now accessible, use deep well 5/8 spark plug socket to remove.