With the Prius’ engine tucked further in closer to the firewall and having the windshield wiper cowl overhanging the area where the ignition coils reside, the cowl must be removed for access clearance. While the steps appear to be complicated, it really isn’t and it should take you no more than an hour to remove and re-install the windshield wiper cowls. Removing the cowl also allow you the opportunity to clean up any debris deposit, such as dried up leaves and berries, especially if you park your car under trees often.
<h2>Tools and Materials Needed</h2>
<p><a href="https://amzn.to/2Wq0ggL" rel="noopener noreferrer" target="_blank">9/16 magnetic spark plug socket</a></p>
<p>14 mm socket</p>
<p>10 mm socket</p>
<p>Flathead screwdriver</p>
<p>Ratchet</p>
<p>Needle nose pliers</p>
<p><a href="https://amzn.to/2WrOvGq" rel="noopener noreferrer" target="_blank">Anti-seize grease</a> (optional)</p>
<p><a href="https://amzn.to/2WlswRD" rel="noopener noreferrer" target="_blank">4x NGK (4912) ILKAR7B11 (4912) Laser Iridium Spark Plugs</a>. These are pre-gapped.</p>