how to fix P0301 cylinder 1 misfire 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 tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Disconnect the high-voltage battery for safety (refer to the Tesla service manual for proper disconnection procedures).

2. Inspect Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable) to access the ignition coils and spark plugs.
• Disconnect the electrical connectors from the ignition coil for cylinder 1.
• Remove the ignition coil using a socket set and inspect for any physical damage or carbon tracking.
• Remove the spark plug using a spark plug socket; inspect for wear, carbon buildup, or oil contamination. Replace if necessary.

3. Check Fuel Injector

• Tools Required: Fuel injector cleaning kit or tester.
• Disconnect the fuel injector connector for cylinder 1.
• Using the fuel injector tester, check the operation of the fuel injector. If it fails to spray properly, replace the injector.

4. Inspect for Vacuum Leaks

• Tools Required: Smoke machine (if available) or carburetor cleaner.
• Visually inspect all vacuum lines and the intake manifold for signs of wear or damage.
• Use a smoke machine to detect vacuum leaks; if leaks are found, replace the affected hoses or gaskets.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine to get a reading.
• Compare the compression value to manufacturer specifications; low compression may indicate a need for further internal engine inspection.

6. Reassemble and Reconnect Battery

• Reinstall the spark plug and ignition coil, torquing to manufacturer specifications.
• Reattach any electrical connectors removed during the inspection.
• Reconnect the high-voltage battery following proper safety protocols.