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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a flat surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Remove Ignition Coil and Spark Plug

• Tools Required: Socket set, ratchet, spark plug socket, torque wrench.
• Unscrew and remove the engine cover if necessary.
• Disconnect the electrical connector from the ignition coil.
• Remove the bolts holding the ignition coil in place and carefully pull it out.
• Use a spark plug socket to unscrew and remove the spark plug from cylinder 2.

3. Inspect and Replace Components

• Inspect the spark plug for wear. If the electrode is worn or the insulator is cracked, replace it.
• Check the ignition coil for cracks or carbon tracking. If damaged, replace it with a new one.
• If necessary, clean the ignition coil connector to ensure a good electrical connection.

4. Reinstall Components

• Install the new spark plug by hand to avoid cross-threading, and then torque it to the manufacturer’s specification (typically around 13-16 lb-ft).
• Place the ignition coil back into position and secure it with the bolts. Reconnect the ignition coil’s electrical connector.
• Reattach the engine cover if it was removed.

5. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the error codes.
• Start the engine and let it idle. Observe for any roughness or misfire.
• Take the vehicle for a test drive to ensure the issue is resolved and no new codes appear.