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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Replace Spark Plug

• Remove the ignition coil for cylinder 2:
  1. Unscrew the bolts securing the coil.
  2. Disconnect the electrical connector.
• Remove the spark plug:
  1. Use a spark plug socket and ratchet to unscrew the spark plug.
• Install new spark plug:
  1. Apply anti-seize compound to the threads of the new spark plug.
  2. Torque the spark plug to the manufacturer’s specification (typically around 13-15 ft-lbs).

3. Inspect/Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil:
  1. Use a multimeter to check for resistance; typical values should be within the manufacturer’s specified range.
  2. If faulty, replace the ignition coil with a new one.

4. Test Fuel Injector

• Using a noid light, connect it to the fuel injector connector for cylinder 2:
  1. Crank the engine and check if the noid light flashes, indicating proper signal.
  2. If it doesn't flash, check the wiring and replace the fuel injector if necessary.

5. Compression Test

• Perform a compression test on cylinder 2:
  1. Remove the spark plug and insert the compression tester.
  2. Crank the engine and note the compression reading.
  3. If the compression is low, investigate for possible valve or head gasket issues.