how to fix 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

• Tools Needed: OBD-II scanner, multimeter, spark plug socket, compression tester, torque wrench, basic hand tools.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Remove the engine cover if applicable.
• Locate the spark plug for cylinder 1.
• Using a spark plug socket, carefully unscrew the spark plug.
• Inspect the spark plug for signs of wear or carbon buildup.
• If necessary, replace with a new spark plug (specify part number based on OEM recommendations).
• Torque the new spark plug to the manufacturer's specifications (typically around 15-20 ft-lbs).

3. Inspect and Test Ignition Coil

• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil using the appropriate socket.
• Test the coil with a multimeter to ensure it meets resistance specifications (check service manual for values).
• If faulty, replace the ignition coil with a new one (specify part number based on OEM recommendations).
• Reinstall the ignition coil and reconnect the harness.

4. Check Fuel Injector

• Ensure the vehicle is off and the battery is disconnected.
• Locate the fuel injector for cylinder 1.
• Inspect the injector connections and wiring for any damage.
• If necessary, test the injector's resistance using a multimeter.
• Replace the fuel injector if it does not meet specifications (specify part number based on OEM recommendations).

5. Compression Test

• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine to obtain a compression reading.
• Compare the reading to manufacturer specifications (typically around 150-200 psi).
• If the compression is low, further investigation into valve seals or piston rings may be necessary.