how to fix P0301 misfire code Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0301 cylinder 1 misfire in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the 12V battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover (if applicable) to access the spark plugs.
• Disconnect the spark plug ignition coils from the harness.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear; replace if necessary with OEM spark plugs.
• Apply dielectric grease to the spark plug threads before installation.
• Torque the new spark plug to the manufacturer’s specifications (typically around 15-20 ft-lbs).

3. Inspect and Replace Ignition Coil

• Remove the ignition coil from cylinder 1 after the spark plug has been replaced.
• Inspect the ignition coil for cracks or damage.
• If defective, replace the ignition coil with an OEM part.
• Reconnect the ignition coil to the harness securely.

4. Clean or Replace Fuel Injector

• If the fuel injector is suspected to be clogged, remove it from the fuel rail.
• Use a fuel injector cleaning kit or ultrasonic cleaner to clean the injector thoroughly.
• If cleaning does not resolve the issue, replace the fuel injector with an OEM part.

5. Reassemble and Reconnect

• Reinstall any components that were removed to access the spark plugs and ignition coils.
• Reconnect the battery terminals.
• Start the vehicle and allow it to reach normal operating temperature.