my Tesla Model 3 Highland (2024-present) shows error code P0300 what does it mean

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery negative terminal to prevent electrical shorts.

2. Inspect Spark Plugs

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the ignition coils to access the spark plugs.
• Inspect each spark plug for signs of wear, damage, or carbon buildup.
• Replace any faulty spark plugs with new ones, ensuring they are gapped to the manufacturer’s specifications (typically around 0.040 inches).
• Reinstall ignition coils, ensuring they are seated properly.

3. Check Ignition Coils

• Tools Required: Multimeter
• Remove the ignition coils from each cylinder.
• Test each coil’s resistance using a multimeter; consult manufacturer specifications for acceptable values.
• Replace any ignition coils that are out of spec.

4. Inspect Fuel Injectors

• Tools Required: Fuel pressure gauge, injector cleaning kit
• Check the fuel pressure at the rail to ensure it meets specifications.
• If fuel pressure is low, inspect the fuel pump and filter.
• Clean or replace any clogged injectors using a cleaning kit.

5. Check Vacuum Lines

• Visually inspect all vacuum lines for cracks, leaks, or disconnections.
• Replace any damaged lines to ensure proper engine operation.

6. Test Engine Compression

• Tools Required: Compression tester
• Remove spark plugs and insert the compression tester into each cylinder.
• Crank the engine and record the compression values. Compare against manufacturer specifications.
• If compression is low, further investigation into the engine's internals may be necessary.