how to fix the P0300 code in my Tesla Model S Original (2012-2020)

Learn how to diagnose and fix P0300 engine misfire in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and materials.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Ignition Coils

• Tools Required: Socket set, torque wrench, dielectric grease
• Remove engine cover if necessary to access ignition coils.
• Disconnect electrical connectors from ignition coils.
• Remove bolts securing the ignition coils and gently pull them out.
• Inspect for cracks or carbon tracking; replace any faulty coils with new units.
• Apply dielectric grease to the connectors before reinstalling.
• Torque bolts to manufacturer specifications.

3. Inspect and Replace Spark Plugs

• Tools Required: Spark plug socket, torque wrench
• Remove ignition coils as described above.
• Use a spark plug socket to carefully unscrew and remove the spark plugs.
• Inspect plugs for wear or fouling; replace with OEM or recommended plugs if necessary.
• Gap the new plugs according to manufacturer specifications.
• Reinstall plugs, torquing to the specified values.

4. Check and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit (if needed)
• Disconnect the fuel injector electrical connectors.
• Remove the fuel rail assembly to access the injectors.
• Inspect injectors for clogs; clean or replace as necessary.
• Reinstall the fuel rail and ensure all connections are secure.

5. Inspect for Vacuum Leaks

• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to check for leaks around intake manifold and hoses.
• Repair or replace damaged hoses as needed.

6. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail test port.
• Start the engine and monitor fuel pressure; compare with manufacturer specifications.
• If pressure is low, inspect the fuel pump and filter for issues.