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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool before starting work.
• Disconnect the negative battery terminal.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil for cylinder 1.
  • Unplug electrical connector from the ignition coil.
  • Remove the mounting bolts and lift out the coil.
• Remove the spark plug.
  • Use a spark plug socket to unscrew the spark plug from the cylinder head.
• Inspect the spark plug for wear, carbon buildup, or damage.
• Replace with a new spark plug if necessary.
  • Torque the new spark plug to manufacturer specifications (typically around 13 lb-ft).

3. Test and Replace Ignition Coil

• Reinstall the ignition coil or replace it if it is found to be faulty.
• Tools Required: Multimeter.
• Test the ignition coil's resistance using a multimeter to ensure it meets specifications.
• If faulty, replace the ignition coil for cylinder 1.
• Reconnect the ignition coil.

4. Inspect and Replace Fuel Injector

• Tools Required: Noid light, fuel injector puller (if necessary).
• Use a noid light to check the signal to the fuel injector for cylinder 1.
• If the injector is not firing, consider replacing it.
• Remove the fuel injector.
  • Disconnect the fuel line and electrical connector.
  • Remove any retaining clips and pull out the injector.
• Install a new fuel injector and reconnect all connections.

5. Reassemble and Test

• Reconnect the battery terminal.
• Start the engine and monitor for check engine light.
• Conduct a test drive to ensure the issue is resolved.