how to fix P0301 misfire code in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts while working on the ignition system.
• Allow the engine to cool down before starting any work.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Locate the spark plug for cylinder 1 (usually on the driver's side).
3. Using a spark plug socket and ratchet, carefully remove the old spark plug.
4. Inspect the old spark plug for wear; replace it with a new spark plug (recommended gap as per manufacturer specifications).
5. Torque the new spark plug to the manufacturer’s specifications (typically around 13 lb-ft).

3. Replace Ignition Coil

1. Disconnect the electrical connector from the ignition coil on cylinder 1.
2. Remove the securing bolt(s) holding the ignition coil in place.
3. Pull the ignition coil out gently.
4. Install the new ignition coil, ensuring it is seated properly.
5. Reconnect the electrical connector and secure the ignition coil with the bolt(s).

4. Check Fuel Injector

1. Disconnect the fuel injector connector for cylinder 1.
2. Remove the fuel rail if necessary to access the injector.
3. Inspect the fuel injector for clogs or damage; replace if necessary.
4. Reinstall the fuel rail and reconnect all electrical connectors.

5. Reassemble and Test

• Reattach any engine covers and ensure that all components are secured.
• Reconnect the battery.
• Start the engine and allow it to idle, monitoring for any misfire symptoms.