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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the ignition coil covers (if applicable) by unscrewing bolts.
• Disconnect the electrical connectors from the ignition coils.
• Remove the ignition coils and inspect the spark plugs.
• If worn or fouled, remove the spark plugs using a spark plug socket.
• Check and adjust the gap of new spark plugs to the manufacturer specifications (typically around 0.043 inches).
• Install new spark plugs and torque them to the manufacturer’s specifications (usually around 13-18 lb-ft).
• Reinstall ignition coils and reconnect electrical connectors.

3. Check and Replace Ignition Coils

• Tools Required: Socket set, multimeter.
• Remove the ignition coils as previously done.
• Test each ignition coil with a multimeter for proper resistance (consult service manual for specifications).
• Replace any faulty coils with new ones.
• Reinstall the ignition coils and ensure all connections are secure.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit (or new injectors), safety goggles.
• If using a cleaning kit, follow the manufacturer's instructions to clean the injectors.
• If replacing, disconnect the fuel rail and remove the old injectors.
• Install new fuel injectors ensuring proper orientation and seating.
• Reconnect the fuel rail and check for leaks.

5. Inspect Vacuum Hoses

• Visually inspect all vacuum lines for cracks or disconnections.
• Replace any damaged hoses with new ones.
• Ensure all connections are secure to prevent vacuum leaks.

6. Perform Compression Test

• Tools Required: Compression gauge.
• Remove spark plugs and insert compression gauge into each cylinder.
• Crank the engine and record the compression readings.
• Compare the readings against manufacturer specifications.
• Address any cylinders with low compression due to mechanical issues.