how to deal with a P0301 code in Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and set the parking brake.
• Disconnect the negative battery cable to ensure safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap tool.
• Remove the ignition coil from cylinder 1.
  • Unplug the electrical connector and remove the mounting bolts.
• Remove the spark plug from cylinder 1 using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary.
  • Use a gap tool to ensure the spark plug is gapped correctly (typically 0.044 inches for Subaru).
• Reinstall the new or inspected spark plug and torque to manufacturer specifications (usually around 13 ft-lbs).

3. Inspect and Replace Ignition Coil

• If the spark plug is good, inspect the ignition coil.
• Replace the ignition coil if it shows signs of cracking or damage.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Check Fuel Injector

• Tools Required: Fuel injector cleaning kit or replacement injectors.
• If the issue persists, remove the fuel injector from cylinder 1.
• Clean or replace the fuel injector as needed.
• Reinstall the injector and ensure all connections are secure.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and install the compression tester.
• Crank the engine and record the compression reading.
• Compare the reading to the manufacturer's specifications (usually around 130-180 psi).
• If compression is low, further diagnosis may be needed (valve or head gasket issues).

6. Inspect for Vacuum Leaks

• Visually inspect hoses and the intake manifold for cracks or loose connections.
• Use propane or carb cleaner to test for vacuum leaks while the engine is running.