my Tesla Outback 4th Generation (2010-2014) has a check engine light and P0301 code

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shock.
• Allow the engine to cool if it was recently operated.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover (if applicable) to access the ignition components.
• Remove the ignition coil for cylinder 1 by unbolting it and disconnecting the electrical connector.
• Remove the spark plug from cylinder 1 using a spark plug socket.
• Inspect the spark plug for wear (check for carbon deposits, wear indicators) and replace if necessary.
• Install a new spark plug to the manufacturer’s torque specification (typically 13-20 lb-ft).
• Reinstall the ignition coil and ensure it is securely connected.

3. Check Fuel Injector

• Tools Required: Noid light or multimeter
• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to test for injector pulse; if no pulse is detected, check wiring and connectors.
• If the injector is faulty, replace it with a new one and ensure it fits securely.

4. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1 and screw in the compression tester.
• Crank the engine a few times to get a reading. Compare the compression reading with manufacturer specifications (usually around 120-200 psi).
• If the compression is low, further investigation into the cylinder's mechanical condition is required.

5. Inspect for Vacuum Leaks

• Tools Required: Vacuum gauge or smoke machine (if available)
• With the engine running, inspect for any hissing sounds indicating a vacuum leak.
• Use a vacuum gauge connected to a manifold vacuum source to check for consistent readings.
• Repair any identified leaks by replacing hoses or gaskets as needed.