how to fix P0301 code on my Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench
• Remove the engine cover if necessary.
• Disconnect any electrical connectors or cables from the ignition coil.
• Remove the ignition coil from Cylinder 1.
• Use a spark plug socket to unscrew and remove the old spark plug.
• Inspect the spark plug gap and replace it with a new spark plug, ensuring it meets OEM specifications.
• Torque the new spark plug to the manufacturer's specification (typically around 13-15 lb-ft).

3. Replace Ignition Coil

• Tools Required: Ratchet, socket set
• With the ignition coil removed, inspect it for cracks or signs of wear.
• Install the new ignition coil onto Cylinder 1 and secure it in place.
• Reconnect any electrical connectors or cables removed earlier.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector removal tool, cleaning kit or new fuel injector
• If cleaning, use a fuel injector cleaning kit following the manufacturer’s instructions.
• If replacing, disconnect the fuel line and electrical connector from the injector.
• Remove the old injector and install the new one, ensuring proper seating and securing it in place.