how to fix P0301 misfire code on 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 required tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, ratchet, gap gauge.
• Remove the engine cover (if applicable) to access the spark plugs.
• Use the spark plug socket and ratchet to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or damage; replace if necessary.
• Check the spark plug gap with a gap gauge and adjust to manufacturer specifications (typically around 0.025-0.035 inches for Tesla).
• Install the new or inspected spark plug and torque it to the manufacturer’s specifications (generally around 15-20 lb-ft).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, ratchet.
• Remove the ignition coil cover (if necessary).
• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Use the socket set to remove the ignition coil from the valve cover.
• Inspect the ignition coil for cracks or damage; replace if necessary.
• Install the new ignition coil and reconnect the electrical connector.

4. Check and Test Fuel Injector

• Tools Required: Fuel injector tester, multimeter.
• Locate the fuel injector for cylinder 1.
• Disconnect the electrical connector from the fuel injector.
• Use a multimeter to test the resistance of the fuel injector; compare to specifications.
• If the injector is faulty, remove it using appropriate tools and replace it with a new injector.

5. Inspect for Vacuum Leaks

• Tools Required: Smoke machine (optional), visual inspection tools.
• Inspect the intake manifold and throttle body for any cracks or loose connections.
• Use a smoke machine to detect vacuum leaks or spray carb cleaner around the intake to identify leaks by observing engine behavior.