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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure you have the vehicle parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2 by unbolting it and disconnecting the electrical connector.
• Use a spark plug socket and ratchet to remove the spark plug from cylinder 2.
• Inspect the spark plug for any signs of wear, carbon buildup, or oil presence.
• Replace with a new spark plug that meets OEM specifications (typically NGK or Denso).
• Torque the new spark plug to 13 lb-ft (17.5 Nm) and reattach the ignition coil.

3. Test or Replace Ignition Coil

• If the spark plug replacement does not resolve the issue, test the ignition coil using a multimeter (should read within specifications).
• If faulty, replace with a new ignition coil for cylinder 2.
• Install the new ignition coil, ensuring it is properly seated and the connector is secure.

4. Inspect Fuel Injector

• If misfire persists, remove the fuel injector for cylinder 2. Check for clogs or leaks.
• Clean the injector using a fuel injector cleaner or replace it if necessary.
• Reinstall the injector and connect all necessary electrical connections.

5. Verify Compression

• If previous steps do not resolve the issue, perform a compression test on cylinder 2.
• If compression is low, further investigation is needed for potential internal engine issues (valves, piston rings).
• Reassemble the components as necessary.