how to fix P0301 misfire code on my Toyota Camry XV50 (2012-2017)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

1. Remove the engine cover if applicable (using a socket set).
2. Disconnect the ignition coil connector from the coil on cylinder 1.
3. Remove the ignition coil (typically requires a 10mm socket).
4. Take out the old spark plug using a spark plug socket.
5. Inspect the new spark plug to ensure it is the correct type and gap.
6. Install the new spark plug and torque it to the manufacturer's specification (usually around 13-15 lb-ft).
7. Reinstall the ignition coil and reconnect the connector.

3. Inspect and Replace Ignition Coil

1. If the spark plug replacement does not resolve the issue, test the ignition coil with a multimeter.
2. If faulty, remove the ignition coil from cylinder 1.
3. Install a new ignition coil by reversing the removal steps, ensuring proper connector engagement.

4. Check Fuel Injector

1. If issues persist, test the fuel injector for cylinder 1 using a fuel pressure gauge.
2. If the injector is malfunctioning, replace it.
3. Remove the fuel rail and replace the injector, ensuring proper seating and connection.

5. Perform Final Checks

• Reconnect the battery terminal.
• Start the engine and check for any new codes or symptoms.