how to diagnose a misfire code P0301 on my Genesis G70 IG (2017-2023)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the battery to prevent any electrical shorts.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1 by unfastening the retaining bolt and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket.
• Install the new spark plug hand-tight, then torque it to the manufacturer’s specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil (if faulty)

• Tools Required: Ratchet, socket set.
• If the ignition coil was found defective during inspection, remove the faulty coil from cylinder 1.
• Install a new ignition coil in place of the old one, ensuring it is seated correctly.
• Reconnect the electrical connector and secure it with the retaining bolt.

4. Fuel Injector Check and Replacement (if necessary)

• Tools Required: Fuel injector puller, ratchet, socket set.
• If the fuel injector is faulty, remove it by disconnecting the electrical connector and unfastening the mounting bolts.
• Install a new fuel injector, ensuring it is seated properly in the intake manifold.
• Reconnect the electrical connector and secure any fasteners.

5. Reconnect Battery and Clear Codes

• Reconnect the battery.
• Use the OBD-II scanner to clear the misfire code from the system.