how to fix P0302 misfire code on my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shocks.
• Allow the engine to cool before beginning work.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Compression tester
• Screwdrivers
• Pliers

2. Replace Spark Plug

1. Remove the ignition coil cover if applicable.
2. Disconnect the ignition coil connector from cylinder 2.
3. Remove the ignition coil from cylinder 2 using the socket set.
4. Remove the spark plug from cylinder 2 using a spark plug socket.
5. Inspect the old spark plug for wear and replace it with a new one, ensuring it is gapped correctly (usually around 0.043 inches for the Corolla).
6. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil (if necessary)

1. If the ignition coil was found faulty during diagnostics, remove the coil from cylinder 2.
2. Install a new ignition coil, ensuring it is seated properly.
3. Reconnect the ignition coil connector.

4. Verify Fuel Injector Operation

1. If the injector is suspected to be faulty, remove the fuel rail assembly.
2. Disconnect the fuel injector connector from cylinder 2.
3. Test the fuel injector using a multimeter to ensure it has the correct resistance (usually around 12-16 ohms).
4. Replace the fuel injector if it is defective and reinstall the fuel rail.

5. Perform Compression Test (if necessary)

1. If compression is low, remove the spark plug from cylinder 2.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading.
4. If compression is below specifications (usually 180-200 psi), further engine diagnostics may be needed.