how to fix the P0301 misfire code in Toyota Corolla E210 (2019-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil by unbolting it and disconnecting the electrical connector.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for carbon buildup or wear; replace it if necessary.
• Install the new spark plug and torque it to manufacturer specifications (typically 13-15 lb-ft).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter
• If the ignition coil is suspected to be faulty, use a multimeter to measure the resistance. Compare it to specifications found in the service manual.
• If out of specification, replace the ignition coil with a new one.
• Reconnect the electrical connector and secure the coil.

4. Inspect and Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaner, fuel line disconnect tool (if needed)
• Disconnect the fuel line and electrical connector from the injector.
• Remove the fuel injector from the rail.
• Clean the injector using a specialized cleaner or replace it if clogged or defective.
• Reinstall the injector, ensuring proper sealing.

5. Perform Compression Test

• Tools Required: Compression tester
• Remove all spark plugs for easier access and connect the compression tester to cylinder 1.
• Crank the engine to take a reading and compare it with manufacturer specifications.
• If compression is low, further investigation into engine internals may be necessary.