how to diagnose a P0302 code in my Toyota Camry XV40 (2007-2011)

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, socket set, torque wrench, compression tester, noid light, multimeter, replacement spark plug and ignition coil (if necessary).
• Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Replace Spark Plug

• Remove Engine Cover (if applicable)

  • Use a socket set to unbolt the engine cover and set it aside.

• Remove Spark Plug

  • Disconnect the ignition coil connector for cylinder 2.
  • Remove the ignition coil by unscrewing it.
  • Use a spark plug socket to remove the spark plug from cylinder 2.

• Install New Spark Plug

  • Gap the new spark plug to the manufacturer’s specifications.
  • Install the new spark plug and torque it to the manufacturer’s specification (usually around 13-15 lb-ft).
  • Reinstall the ignition coil and reconnect its connector.

3. Replace Ignition Coil (if necessary)

• Follow the steps in "Remove Spark Plug" to access the ignition coil.
• Remove the faulty ignition coil and replace it with a new one.
• Reconnect all connectors and ensure they are secure.

4. Clean or Replace Fuel Injector (if necessary)

• If the noid light test indicates a problem, remove the fuel injector for cylinder 2.
• Clean the injector using a specialized cleaner or replace it if necessary.
• Reinstall the injector ensuring proper sealing.

5. Verify Compression (if necessary)

• Connect a compression tester to cylinder 2’s spark plug hole.
• Crank the engine and record the compression reading.
• Compare the reading to manufacturer specifications. If low, further diagnose for internal engine issues.