how to deal with 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 the necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the vehicle to cool down if the engine has been running.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the engine cover if applicable.
• Use a socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of fouling or damage.
• If damaged, replace it with a new spark plug, ensuring it meets the manufacturer's specifications.
• Torque the new spark plug to the specified value (typically around 18-20 ft-lbs).

3. Check and Replace Ignition Coil (if needed)

• Tools Required: Socket set
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil retaining bolts and take out the coil.
• Inspect for cracks or damage; replace it if faulty.
• Reinstall the new ignition coil, securing it with the retaining bolts.

4. Inspect Fuel Injector

• Tools Required: Fuel pressure gauge
• Disconnect the fuel injector connector.
• Use a fuel pressure gauge to measure the pressure while cranking the engine.
• If the pressure is below specifications, consider replacing the fuel injector for cylinder 1.

5. Compression Test (if misfire persists)

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and note the compression reading.
• Compare to manufacturer specifications to determine cylinder health.