how to diagnose and fix the P0302 code on my Toyota Camry XV50 (2012-2017)?

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect the ignition coil connector for cylinder 2.
  3. Remove the ignition coil bolt and lift the coil out.
  4. Use a spark plug socket to remove the spark plug from cylinder 2.
  5. Inspect the old spark plug for wear; replace it with a new one if required.
  6. Reinstall the spark plug, tightening to the manufacturer's specified torque (typically around 13-16 lb-ft).
  7. Reinstall the ignition coil and connect the electrical connector.

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil was found defective, remove it as described in the previous step.
  2. Install the new ignition coil onto the spark plug, ensuring it's seated properly.
  3. Reattach the ignition coil connector.

4. Test Fuel Injector

• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Connect a noid light to the injector connector to check for signal.
  3. If there is no signal, trace wiring back to the ECU for potential issues.
  4. If the injector is faulty, replace it by removing the fuel rail and pulling the injector out.

5. Reassemble and Check

• Reinstall any engine covers and ensure all connections are secure.
• Reconnect the negative battery terminal.