how to fix a P0301 misfire code in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket, ignition coil puller (if necessary)
• Remove the engine cover if applicable.
• Locate spark plug and ignition coil for cylinder 1.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil by unscrewing the retaining bolts and pulling it out.
• Use a spark plug socket to remove the spark plug.
• Install a new spark plug, ensuring it is torqued to the manufacturer's specification (usually around 12-15 ft-lbs).
• Insert the new ignition coil and secure it with bolts.
• Reconnect the electrical connector.

3. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller, fuel line disconnect tool
• Ensure the fuel system is depressurized before disconnecting any lines.
• Disconnect the fuel line from the injector.
• Remove the retaining clips and pull out the fuel injector from the rail.
• Install the new fuel injector and reattach the clips.
• Reconnect the fuel line securely.

4. Conduct Compression Test (if necessary)

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine several times and record the reading.
• Compare the reading to manufacturer specifications; if low, further investigation is needed for potential internal engine issues.