how to deal with 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 Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector cleaner, vacuum gauge.
• Ensure the vehicle is parked on a level surface with the parking brake engaged.
• Disconnect the battery to prevent electrical shorts.

2. Inspect Ignition Components

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil using a socket wrench.
• Inspect the spark plug condition; if worn, replace it with a new one.
• Reinstall the ignition coil and secure it to the specified torque (typically 7-10 Nm).

3. Test Fuel Injector

• Remove the fuel injector for cylinder 1.
• Inspect for carbon buildup; clean using a fuel injector cleaner if necessary.
• Test the injector with a multimeter for resistance (typically around 12-16 ohms).
• Reinstall the injector ensuring it is properly seated.

4. Perform Compression Test

• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine for a few seconds and record the pressure reading.
• Compare the reading to the manufacturer's specifications (usually around 150-200 psi).
• If low, further investigation into the piston rings or valves may be necessary.

5. Check for Vacuum Leaks

• Use a vacuum gauge to check the engine vacuum.
• Inspect hoses connected to the intake manifold and throttle body for cracks or disconnections.
• If leaks are found, replace damaged hoses to restore proper vacuum levels.