how to fix P0300 code on Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather tools and equipment, including an OBD-II scanner, multimeter, socket set, and torque wrench.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket set to remove the spark plug wires or ignition coils carefully.
• Remove the old spark plugs using a spark plug socket; inspect for wear or damage.
• Install new spark plugs, ensuring the gap is set to manufacturer specifications (usually around 0.040 inches for Model 3).
• Torque the spark plugs to the manufacturer’s specifications (typically around 15-20 ft-lbs).
• Reinstall the ignition coils and reconnect the spark plug wires.

3. Test Ignition Coils

• Using a multimeter, check each ignition coil's primary and secondary resistance according to service manual specifications.
• If any coils fail the test, replace them with new units.

4. Inspect and Clean Fuel Injectors

• Remove the fuel rail and injectors if deemed necessary.
• Clean the fuel injectors using an ultrasonic cleaner or replace them if they are clogged or damaged.
• Reinstall the injectors and fuel rail, ensuring all seals are intact to prevent leaks.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses and connections to ensure they are secure and free from cracks.
• Use a smoke machine or carburetor cleaner to test for leaks around the intake manifold and hoses.