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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the battery to prevent electrical shorts.
• Tools required: OBD-II scanner, socket set, multimeter, compression tester, torque wrench.

2. Replace Spark Plug

1. Remove the ignition coil cover if necessary.
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 old spark plug for wear (electrode condition, gap).
5. Install a new spark plug, ensuring the gap is set to manufacturer specifications (typically 0.043 inches).
6. Reinstall the ignition coil and connect the electrical connector.

3. Inspect and Replace Ignition Coil (if necessary)

1. If the ignition coil was faulty, replace it with a new one.
2. Ensure all electrical connectors are secure and free of corrosion.
3. Torque the ignition coil to manufacturer specifications.

4. Test Fuel Injector (if necessary)

1. If the fuel injector is suspected, remove it from cylinder 2.
2. Use a multimeter to check the injector resistance (should be typically around 12-16 ohms).
3. If the resistance is out of specification, replace the fuel injector.
4. Reinstall the injector and ensure proper seating.

5. Perform Compression Test (if necessary)

1. Remove the spark plug from cylinder 2 and install the compression tester.
2. Crank the engine for a few seconds and record the compression reading.
3. Compare the reading to manufacturer specifications (typically 180-220 psi).
4. If the compression is low, further diagnostic is needed to determine if it's a valve issue or piston ring failure.