Any chance the PO has some type of alarm system installed on it?
Look for a switch that doesn't belong, or a little red light that might/might not be on/blinking. Maybe even call the PO to ask.
Other then that,off the top of my head, the crank position sensor is a known problem, can go bad, no start and no code at times.
But anywho to check the coil pack, I found this, you will need an ohm meter.
Disconnect the ground cable from the battery.
Remove the coil pack from the engine and set it on a clean work surface.
<li class="step ">
<li class="step "> Activate the ohmmeter and set it on 20,000 ohms.
<li class="step "> Press both of the ohmmeter leads against the connections inside of each spark plug boot on the coil pack, one at a time (six total). Do not let the leads touch each other or else you will receive a faulty rating. The ohmmeter rating should fall between 6,000 and 30,000 ohms. If the ohmmeter rating is above or below this range, replace the coil pack.
<li class="step "> Change the ohmmeter setting to 10 ohms.
<li class="step "> Hold one lead in your left hand and one lead in your right hand. Press the left ohmmeter lead against the center prong inside the electrical connector on the back of the coil pack. Press the other lead against each of the spark plug boots, one at a time. The ohmmeter rating should be below 2 ohms. If the ohmmeter rating is above 2 ohms, replace the coil pack.