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

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil from cylinder 1 by unscrewing the mounting bolt and disconnecting the electrical connector.
• Unscrew the spark plug using a spark plug socket and ratchet.
• Inspect the old spark plug for wear; if damaged, replace it with a new one.
• Install the new spark plug, ensuring it's torqued to the manufacturer's specification (typically around 13 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the spark plug is fine, and the ignition coil was swapped during diagnostics, replace the faulty ignition coil with a new one.
• Ensure the new ignition coil is seated properly and connect the electrical connector securely.

4. Clean or Replace Fuel Injector (if necessary)

• If fuel injector operation was suspected, remove the fuel injector from cylinder 1.
• Clean the injector using a fuel injector cleaner kit or replace with a new injector if cleaning does not resolve the issue.
• Reinstall the fuel injector ensuring proper sealing.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle.
• Use the OBD-II scanner to clear the codes and check if the P0301 code reappears.