how to fix the P0300 misfire code in my Toyota Camry XV70 (2018-2024)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, vacuum gauge.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before beginning work.

2. Replace Spark Plugs

1. Remove the engine cover if applicable.
2. Use a socket to remove the spark plugs. Inspect each for wear or carbon buildup.
3. Install new spark plugs, ensuring they are gapped to the manufacturer’s specifications (typically between 0.043-0.047 inches for most Toyota engines).
4. Torque the spark plugs to the recommended specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coils

1. Disconnect the electrical connectors from the ignition coils.
2. Remove the ignition coils using a socket.
3. Inspect for any signs of damage or corrosion; replace any defective coils with new ones.
4. Reinstall the ignition coils and reconnect the electrical connectors.

4. Test and Clean Fuel Injectors

1. If injector issues are suspected, use a fuel injector cleaner or professional cleaning service.
2. If still problematic, remove and inspect the fuel injectors for clogs or damage.
3. Replace any faulty fuel injectors with new ones.

5. Vacuum Leak Test

1. Use a vacuum gauge to check for leaks in the intake system.
2. If a leak is detected, locate and repair the source, such as cracked hoses or gaskets.

6. Inspect MAF Sensor

1. Disconnect the MAF sensor connector and remove the sensor from the intake.
2. Clean the MAF sensor with MAF cleaner to remove any debris or contamination.
3. Reinstall the MAF sensor and reconnect the electrical connector.