how to fix P0302 code on my Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, dielectric grease.
• Remove the engine cover (if applicable) to access the spark plugs.
• Disconnect the ignition coil connector from the spark plug.
• Remove the ignition coil and spark plug from cylinder 2.
• Inspect the spark plug; if damaged or worn, replace it with a new one.
• Apply dielectric grease to the tip of the new spark plug, torque it to the manufacturer's specification (usually around 13-16 ft-lbs).
• Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if needed)

• If the spark plug is in good condition, swap the ignition coil from cylinder 2 with another cylinder.
• Clear the error codes and start the engine to see if the misfire follows the ignition coil.
• If the misfire moves to the other cylinder, replace the ignition coil for cylinder 2.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, fuel line removal tool.
• If the misfire persists, remove the fuel injector for cylinder 2.
• Clean the injector using an appropriate fuel injector cleaning kit or replace it if necessary.
• Reinstall the injector securely.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug for cylinder 2 and insert the compression tester.
• Crank the engine to check the compression reading; it should be within the specifications (usually around 180-200 psi).
• If the compression is low, further diagnosis may be required for internal engine issues.