how to fix P0303 code misfire in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before working on ignition components.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil cover (if applicable).
• Use a socket to carefully remove the spark plug from cylinder 3.
  • Inspect the spark plug for fouling, wear, or damage.
  • Replace with a new spark plug if necessary (ensure correct gap).
• Torque the new spark plug to manufacturer specifications (usually around 13-15 lb-ft).

3. Check and Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from cylinder 3.
• Inspect for cracks or signs of wear.
• Replace with a new ignition coil if faulty.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Disconnect the fuel injector electrical connector and fuel line (use caution with fuel).
• Remove the fuel injector from cylinder 3.
• Inspect and clean the injector using a fuel injector cleaner or replace if clogged.
• Reinstall the fuel injector and reconnect the fuel line and electrical connector.

5. Perform Compression Test

• Remove the spark plug from cylinder 3.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications; replace the cylinder head gasket or repair if compression is low.

6. Check for Vacuum Leaks

• Inspect all hoses around the intake manifold for cracks or disconnections.
• Use a smoke test or carburetor cleaner to check for leaks while the engine is running.
• Repair any vacuum leaks found.