Spark. The piece of the combustion puzzle that brings your engine to life. Previously, manufacturers used a mechanical ignition system featuring a single ignition coil and a distributor.
Today, coil-on-plug systems dominate the market. Both ignition systems rely on a crankshaft position sensor to time their ignition with crankshaft position. When this vital sensor fails, you will get a P0321 check engine light code. Not only is this sensor vital to the correct running of your engine, but without it, it may not start.
Of course, you need to know what this code means and how to fix it. This guide will walk you through the common causes, symptoms, and how to diagnose and fix this trouble code.
