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

Solution

1. Preparation

• Gather tools and parts needed: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, new spark plug, new ignition coil (if needed), and fuel injector cleaner.
• Ensure the vehicle is parked on a flat surface with the engine off and cool.

2. Replace Spark Plug

• Remove Engine Cover: Use the socket set to remove any bolts securing the engine cover, if applicable.
• Remove Spark Plug: Use a spark plug socket to carefully unscrew the spark plug from cylinder 1. Inspect and clean the area around the spark plug hole.
• Install New Spark Plug: Insert the new spark plug and torque it to the manufacturer’s specification (typically around 13-16 lb-ft). Reattach any components removed for access.

3. Inspect and Replace Ignition Coil

• Disconnect Ignition Coil: Unplug the connector from the ignition coil on cylinder 1.
• Remove Ignition Coil: Unscrew the bolts securing the ignition coil and carefully pull it out.
• Install New Ignition Coil: Place the new ignition coil into position, secure it with bolts, and reconnect the electrical connector.

4. Clean or Replace Fuel Injector (if necessary)

• Remove Fuel Injector: Disconnect the fuel line and electrical connector from the fuel injector for cylinder 1. Use a socket to remove any securing bolts.
• Inspect Injector: If cleaning, use fuel injector cleaner according to product instructions. If replacing, install a new injector and ensure a proper seal.
• Reattach Components: Secure the fuel injector and reconnect the fuel line and electrical connector.