how to fix P0301 misfire code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety.
• Allow the engine to cool down completely before starting the procedure.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the ignition coil from cylinder 1:
  1. Disconnect the electrical connector.
  2. Remove the retaining bolts and pull out the coil.
• Remove the spark plug using a spark plug socket:
  1. Inspect the spark plug for signs of wear, fouling, or damage.
  2. Replace if necessary with an OEM or equivalent part.
  3. Set the gap according to manufacturer specifications (typically around 0.044 inches for Subaru).
• Reinstall the spark plug and ignition coil, ensuring proper torque (usually around 13 ft-lbs for plugs).

3. Inspect and Replace Ignition Coil (if needed)

• If the spark plug is in good condition, test the ignition coil:
  1. Perform a primary and secondary resistance test using a multimeter to ensure it is within specifications.
  2. If the coil is faulty, replace it with a new one.
• Reconnect the ignition coil and electrical connector securely.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit or dedicated fuel injector cleaner.
• If the fuel injector is clogged:
  1. Remove the fuel rail and injector from cylinder 1.
  2. Clean the injector using the cleaning kit or replace it if necessary.
  3. Reinstall the injector and fuel rail, ensuring proper sealing and connection.

5. Compression Test (if misfire persists)

• Tools Required: Compression gauge.
• Test the compression of cylinder 1:
  1. Remove spark plug and insert the compression gauge.
  2. Crank the engine and record the compression reading.
  3. Compare the reading to manufacturer specifications. If low, further diagnosis of piston rings or valves may be necessary.