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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the negative terminal of the battery to prevent electrical shock.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Unplug the spark plug wire or ignition coil connector from cylinder 1.
• Use the spark plug socket to remove the old spark plug.
• Inspect the spark plug's condition for signs of wear or fouling.
• Install the new spark plug and torque it to the manufacturer’s specifications (typically around 13-16 lb-ft).
• Reconnect the spark plug wire or ignition coil connector.

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Remove the ignition coil for cylinder 1 by unscrewing the mounting bolts.
• Disconnect the electrical connector from the ignition coil.
• Install the new ignition coil and secure it with the mounting bolts, torquing them to manufacturer specifications (usually around 7-9 lb-ft).
• Reconnect the electrical connector.

4. Inspect/Replace Fuel Injector

• Tools Required: Fuel injector puller, socket set.
• Remove the fuel rail if necessary to access the injector.
• Disconnect the fuel injector connector and fuel line (be cautious of fuel spillage).
• Remove the old fuel injector from the rail.
• Install the new fuel injector with new O-rings.
• Reassemble the fuel rail and reconnect all connections.

5. Perform Compression Test (if needed)

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole.
• Crank the engine a few times to obtain a reading.
• Compare the compression reading with manufacturer specifications.