how to address the P0301 misfire in 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 starting work.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Using a spark plug socket, remove the spark plug from cylinder 1.
• Inspect the condition of the spark plug; replace it if fouled or worn.
• Install the new spark plug and torque it to the manufacturer’s specification (typically around 13-16 lb-ft).

3. Inspect/Replace Ignition Coil

• Remove the electrical connector from the ignition coil on cylinder 1.
• Unscrew the ignition coil retaining bolts and remove the coil.
• Test the ignition coil with a multimeter to check for proper resistance.
• If faulty, replace with a new ignition coil.
• Reinstall the coil and reconnect the electrical connector.

4. Check/Replace Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Remove the fuel rail if necessary to access the injector.
• Inspect the injector for clogs or damage.
• If faulty, replace it with a new fuel injector.
• Reinstall the fuel rail and reconnect the injector connector.

5. Compression Test (if necessary)

• Remove the spark plug from cylinder 1.
• Insert a compression gauge into the spark plug hole.
• Crank the engine for a few seconds and record the reading.
• Compare the reading to the manufacturer’s specifications (typically 180-200 psi).
• If compression is low, further investigation into the engine’s internal components may be necessary.