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

• Gather tools and parts required for the repair.
• Disconnect the vehicle's 12V battery to ensure safety while working.

2. Inspect and Replace Ignition Coil

• Remove the engine cover if necessary.
• Locate the ignition coil for cylinder 1 (refer to vehicle manual for exact location).
• Disconnect the wiring harness from the ignition coil.
• Remove the ignition coil using a socket set.
• Replace with a new ignition coil, ensuring it is seated properly.
• Reconnect the wiring harness.

3. Inspect and Replace Spark Plug

• Remove the ignition coil again to access the spark plug.
• Use a spark plug socket and ratchet to remove the spark plug.
• Inspect the spark plug for wear, carbon build-up, or damage.
• Replace with a new spark plug that meets manufacturer specifications (refer to owner’s manual for part number).
• Torque the spark plug to the manufacturer’s specifications (typically around 15 ft-lbs).

4. Inspect Fuel Injector

• Locate the fuel injector for cylinder 1.
• Disconnect the fuel injector wiring harness.
• Remove the fuel injector with appropriate tools (may require special injector puller).
• Inspect for clogs or issues; clean or replace if necessary.
• Reinstall the injector and reconnect the wiring harness.

5. Conduct Compression Test

• Insert a compression gauge into the spark plug hole for cylinder 1.
• Crank the engine several times to get a reading.
• Record the compression value and compare to manufacturer specifications.
• If compression is low, further investigation into internal engine issues may be required.