how do I diagnose P0301 misfire code in 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 needed for the repair.
• Disconnect the vehicle's battery to prevent electrical shock.
• Ensure the engine is cool before beginning work.

2. Inspect and Replace Spark Plug

• Remove Engine Cover: Use a socket set to remove any bolts securing the engine cover.
• Remove Spark Plug: Use a spark plug socket to carefully unscrew and remove the spark plug from cylinder 1.
• Inspect Spark Plug: Check for signs of burning, fouling, or damage. Replace if necessary with OEM specifications.
• Install New Spark Plug: Install the new spark plug, ensuring it is torqued to the manufacturer’s specifications (typically around 15-20 ft-lbs).

3. Inspect and Replace Ignition Coil

• Remove Ignition Coil: Disconnect the electrical connector and unscrew the ignition coil from cylinder 1.
• Inspect Ignition Coil: Check for cracks or signs of damage. Replace if faulty.
• Install New Ignition Coil: Secure the new ignition coil in place and reconnect the electrical connector.

4. Check Fuel Injector

• Remove Fuel Injector: Disconnect the fuel rail and carefully remove the fuel injector for cylinder 1.
• Inspect Injector: Check for clogs or leaks. Clean or replace as necessary.
• Reinstall Fuel Injector: Ensure it is seated correctly and reconnect the fuel rail.

5. Reassemble and Reconnect

• Reattach Engine Cover: Secure the engine cover back in place with the previously removed bolts.
• Reconnect Battery: Reconnect the vehicle's battery terminals.