how to fix P0302 misfire code in Toyota Corolla E170 (2013-2019)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Raise the vehicle if necessary and secure it with jack stands.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector and remove the ignition coil from cylinder 2.
  3. Remove the spark plug using a spark plug socket.
  4. Inspect the spark plug for signs of wear (e.g., fouling, gap issues).
  5. Replace the spark plug with a new one (OEM specification gap).
• Tools Required: Spark plug socket, ratchet, torque wrench.
• Safety Warning: Ensure the engine is cool to avoid burns.

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is fine, test the ignition coil for cylinder 2 using a multimeter.
  2. If faulty, replace the ignition coil with a new one.
  3. Reinstall the ignition coil and reconnect the electrical connector.
• Tools Required: Multimeter, ratchet.
• Safety Warning: Reconnect the battery only after all work is completed.

4. Inspect and Test Fuel Injector

• Sub-steps:
  1. Remove the fuel rail if necessary to access the fuel injector for cylinder 2.
  2. Test the fuel injector using a noid light to check for proper operation.
  3. If faulty, replace the fuel injector with a new one.
  4. Reassemble the fuel rail and ensure all connections are secure.
• Tools Required: Noid light, ratchet.
• Safety Warning: Relieve fuel pressure before working on the fuel system.

5. Perform Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 2.
  2. Insert a compression gauge into the spark plug hole.
  3. Crank the engine several times and record the compression reading.
  4. Compare the reading with factory specifications. If low, further diagnosis is needed for potential internal issues.
• Tools Required: Compression gauge.
• Safety Warning: Ensure the ignition system is disabled while performing this test.