my Tesla Model 3 Highland (2024-present) has a check engine light and I see code P0301, what’s wrong...

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the vehicle's 12V battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable) to access the spark plugs.
• Use the spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of fouling or wear. If damaged, replace it with a new spark plug.
• Torque the new spark plug to the manufacturer's specification (typically around 18-22 ft-lbs).
• Reinstall the engine cover.

3. Check and Replace Ignition Coil

• Tools Required: Socket set.
• Locate the ignition coil for cylinder 1 after removing the spark plug.
• Disconnect the electrical connector from the ignition coil.
• Remove the retaining bolts and take out the ignition coil.
• Test the ignition coil with a multimeter or replace it with a new one.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injector

• Tools Required: Fuel injector puller (if necessary), cleaning solvent.
• Remove the fuel rail if the injector is not accessible.
• Disconnect the fuel injector connector and remove the fuel injector from cylinder 1.
• Check for clogs or damage in the injector; clean or replace if needed.
• Reinstall the fuel injector, ensuring it seats properly.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester and crank the engine for a few seconds.
• Compare the compression reading to the manufacturer's specifications (typically 150-200 psi).
• If compression is low, further investigation into engine internals may be required.