how to fix P0304 code on Tesla Outback 6th Generation (2020-2024)?

Learn how to diagnose and fix P0304 cylinder 4 misfire in Tesla Outback 6th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Locate cylinder 4 spark plug (consult service manual for exact location).
  3. Using a spark plug socket, remove the spark plug.
  4. Inspect the spark plug for wear, carbon buildup, or damage.
  5. If necessary, replace with a new spark plug (check specifications for gap).
  6. Reinstall the spark plug and torque to manufacturer specifications (typically 13-15 lb-ft).

3. Check and Replace Ignition Coil

• Sub-steps:
  1. Disconnect the wiring harness from the ignition coil on cylinder 4.
  2. Remove the ignition coil using a socket.
  3. Test the ignition coil with a multimeter (check primary and secondary resistance).
  4. If defective, replace the ignition coil with a new one.
  5. Reinstall ignition coil and reconnect the wiring harness.

4. Inspect and Clean/Replace Fuel Injector

• Sub-steps:
  1. Remove the fuel injector connector from cylinder 4.
  2. Remove the fuel rail if necessary to access the injector.
  3. Inspect the injector for clogs; use a fuel injector cleaner if needed.
  4. If defective, replace the fuel injector with a new one.
  5. Reinstall the fuel rail and reconnect the injector connector.

5. Compression Test

• Sub-steps:
  1. Remove spark plugs from all cylinders.
  2. Insert a compression gauge into the cylinder 4 spark plug hole.
  3. Crank the engine for several seconds and read the compression value.
  4. Compare values across all cylinders; if cylinder 4 is low, further investigation is needed.