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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Remove the ignition coil by unscrewing the bolts (if applicable) and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket and ratchet. Inspect it for wear, carbon buildup, or oil contamination.
• If damaged, replace with a new spark plug (OEM recommended).
• Install the new spark plug, torquing it to the manufacturer’s specification (typically around 13-16 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cracks or damage.
• If faulty, remove the ignition coil and replace it with a new unit. Ensure it is securely connected and bolts are tightened to the specified torque.

4. Check Fuel Injector Operation

• Remove the fuel injector connector for Cylinder 1.
• Test the injector using a multimeter to ensure it is receiving power.
• If the injector is faulty, remove it from the rail and replace it with a new fuel injector.

5. Reassemble and Test

• Reconnect the battery terminal.
• Start the engine and check for any check engine light codes using the OBD-II scanner.
• Clear any diagnostic codes and monitor for reoccurrence of the P0301 code.