how to diagnose P0302 code on my Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the vehicle.
• Allow the engine to cool if it has been running.

2. Replace Spark Plug

1. Remove the engine cover (if applicable) using a socket set.
2. Locate the spark plug for cylinder 2.
3. Use a spark plug socket to unscrew and remove the old spark plug.
4. Inspect the old spark plug for signs of damage, and compare with specifications.
5. Install the new spark plug, ensuring it is gapped correctly (usually around 0.044 inches for Subaru).
6. Torque the spark plug to the manufacturer’s specifications (typically around 13 lb-ft).

3. Inspect and Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil on cylinder 2.
2. Remove the coil by unscrewing the mounting bolts.
3. Inspect the coil for cracks or damage; if damaged, replace it with a new one.
4. Reinstall the new ignition coil, securing it with the mounting bolts and reconnecting the electrical connector.

4. Check Fuel Injector

1. Remove the fuel rail (if necessary) to access the injector for cylinder 2.
2. Inspect the fuel injector for clogs or dirt. Clean or replace if needed.
3. Reinstall the fuel rail and ensure all connections are secure.

5. Compression Test

1. Remove the spark plug for cylinder 2 and attach the compression gauge.
2. Crank the engine and record the compression reading.
3. Compare the reading to manufacturer specifications (usually around 120-180 psi).
4. If compression is low, further investigation may be needed for internal engine issues.