how to fix P0300 random misfire code in Toyota Camry Seventh Generation (2012-2017)

Solution

1. Preparation

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

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coils by unscrewing the bolts and gently pulling them off the spark plugs.
• Use the spark plug socket to remove the old spark plugs. Inspect the plugs for wear or fouling.
• Install new spark plugs by threading them in by hand to avoid cross-threading, then torque to the manufacturer’s specification (typically around 13 lb-ft).
• Reinstall the ignition coils, ensuring they are seated properly and secured with bolts.

3. Inspect and Replace Ignition Coils (if necessary)

• If any ignition coils were found defective during diagnostics, remove them as previously described.
• Replace with new ignition coils, ensuring they match the specifications for the 2012-2017 Camry.
• Reconnect the electrical connectors and secure with the bolts.

4. Clean or Replace Fuel Injectors

• If fuel injectors are clogged or not functioning properly, remove them from the fuel rail.
• Use a fuel injector cleaner or ultrasonic cleaner to clean the injectors, or replace them if necessary.
• Reinstall the cleaned or new injectors, ensuring O-rings are lubricated and seated properly.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses for cracks or disconnections. Replace any damaged hoses.
• If a leak is detected, repair or replace the affected components.

6. Inspect Air Intake System

• Check the air filter for clogs; replace if dirty.
• Clean the MAF sensor using MAF cleaner spray.
• Reinstall all components securely.