how to fix P0302 misfire code in my Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery negative terminal to ensure safety while working on the electrical systems.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Sub-steps:
  1. Remove the ignition coil from cylinder 2 by unscrewing any bolts and disconnecting the electrical connector.
  2. Inspect the spark plug for wear or damage (carbon buildup, cracks). If necessary, replace it with a spark plug specified by the manufacturer (e.g., NGK or Denso).
  3. If the ignition coil is faulty, replace it with a new unit, ensuring it is properly seated and connected.
  4. Apply dielectric grease to the new spark plug boot to ensure a good electrical connection.

3. Check and Replace Fuel Injector

• Tools Required: Fuel injector removal tool (if necessary), socket set.
• Sub-steps:
  1. Disconnect the fuel injector electrical connector for cylinder 2.
  2. Remove the fuel rail if required to access the injector (ensure to relieve fuel pressure first).
  3. Inspect the fuel injector for blockages or leaks; replace if any issues are found.
  4. Reinstall the fuel rail and ensure all connections are tight.

4. Perform Compression Test

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove the spark plug from cylinder 2 and install the compression tester.
  2. Crank the engine a few times and record the compression reading.
  3. If the reading is below specification (consult manufacturer’s manual), further engine diagnosis may be required.

5. Reassemble and Reconnect

• After replacing necessary components, reassemble any removed parts.
• Reconnect the battery negative terminal.