how to fix P0300 misfire code in Tesla Model 3 Highland (2024-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface with the parking brake engaged.
• Disconnect the negative battery terminal to avoid electrical shock.

2. Inspect Spark Plugs and Ignition Coils

• Remove the engine cover if applicable.
• Use a socket set to remove the spark plugs.
• Inspect each spark plug for fouling or wear; replace if necessary.
• Test each ignition coil for continuity and resistance using a multimeter; replace any faulty coils.

3. Test Fuel Injectors

• Connect a fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure against manufacturer specifications.
• If the pressure is low, inspect fuel lines for leaks and ensure the fuel pump is functioning properly.

4. Examine Air Intake System

• Visually inspect the air filter for blockage and replace if necessary.
• Check the intake manifold for leaks; use a smoke machine if needed to detect vacuum leaks.
• Ensure that the throttle body is clean and functioning properly.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any stored misfire codes from the memory.
• Start the engine and monitor for any reoccurrence of the P0300 code.