my Tesla Outback 5th Generation (2015-2019) has a check engine light with code P0301

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear; if it appears worn or damaged, replace it with a new one.
• Apply a small amount of dielectric grease to the ignition coil boot.
• Install the new spark plug and torque it to the manufacturer’s specifications (usually around 13-20 lb-ft).
• Reinstall the ignition coil and reconnect the connector.

3. Inspect and Test Fuel Injector

• Tools Required: Noid light (if available), fuel pressure gauge.
• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check if the injector is receiving a signal; the light should blink when the engine is cranked.
• If no signal is detected, check the wiring and connectors for damage.
• If the injector is not functioning, replace it with a new one and ensure it is properly seated.

4. Check for Vacuum Leaks

• Tools Required: Engine vacuum gauge or smoke machine.
• With the engine running, inspect for hissing noises indicating vacuum leaks around the intake manifold and associated hoses.
• If a leak is found, replace the damaged hose or gasket as necessary.

5. Perform a Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug for cylinder 1.
• Insert the compression gauge into the spark plug hole and crank the engine for several revolutions.
• Record the compression reading and compare it to the manufacturer's specifications (usually around 120-200 psi).
• If the compression is low, further engine diagnosis may be necessary.