how to resolve P0300 random misfire code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, gap gauge
• Remove the ignition coil assembly (if applicable) by unscrewing the bolts and gently pulling them out.
• Remove the spark plugs using the socket set.
• Inspect each spark plug for wear and carbon buildup, replacing any that are damaged.
• Use a gap gauge to ensure the new spark plugs are gapped correctly (usually around 0.044 inches for this model).
• Reinstall the spark plugs, tightening them to the manufacturer’s specified torque (typically 13 lb-ft).
• Reattach the ignition coils.

3. Inspect and Test Ignition Coils

• Tools Required: Multimeter
• Disconnect the ignition coil connector.
• Set the multimeter to the resistance setting and measure the primary and secondary resistance of the coils, comparing them to the manufacturer’s specifications.
• Replace any ignition coils that do not meet specifications.
• Reconnect the ignition coil connectors.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge to the test port.
• Turn the ignition to the "ON" position (without starting the engine) and record the pressure.
• If the pressure is low, inspect the fuel filter and fuel pump for issues.
• Replace the fuel filter if necessary and test the fuel pump operation.

5. Inspect Air Intake and Vacuum Lines

• Visually inspect the air intake system for cracks or loose connections.
• Check vacuum lines for any signs of wear or disconnection.
• Replace any damaged components and ensure all connections are secure.