how to fix P0303 misfire code in Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from the spark plug.
  3. Remove the ignition coil using a socket set.
  4. Remove the spark plug using a spark plug socket.
  5. Inspect the spark plug for wear; replace it if necessary with OEM or equivalent spark plugs.
  6. Reinstall the spark plug (torque to manufacturer's specifications, typically around 13-15 lb-ft).
  7. Reattach the ignition coil and connector.

3. Test and Replace Ignition Coil

• Sub-steps:
  1. Use a multimeter to test the ignition coil for proper resistance (check service manual for specifications).
  2. If faulty, remove the ignition coil from cylinder 3 and replace it with a new one.
  3. Reconnect the ignition coil and ensure it is securely attached.

4. Inspect and Replace Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector from cylinder 3.
  2. Remove the fuel rail if necessary (ensure fuel pressure is relieved before doing so).
  3. Remove the faulty fuel injector and inspect for clogs or damage.
  4. Replace with a new fuel injector as needed.
  5. Reassemble the fuel rail and reconnect the fuel injector connector.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 3 again for access.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine a few times and record the compression reading.
  4. Compare the reading to manufacturer specifications (typically between 130-190 psi).
  5. If compression is low, further investigation into mechanical issues may be required.