how to fix P0300 code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Raise the vehicle if necessary and ensure it is secure on jack stands.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coils by unscrewing the bolts and disconnecting the electrical connectors.
• Use the spark plug socket to remove the old spark plugs.
• Inspect the condition of the spark plugs; replace them if they are worn, fouled, or damaged.
• Install new spark plugs with a torque specification of 13 lb-ft (17 Nm).
• Reinstall the ignition coils securely.

3. Check and Replace Ignition Coils (if needed)

• If misfires persist after replacing spark plugs, inspect each ignition coil.
• Swap suspect coils with known good ones from another cylinder and recheck for misfire codes.
• If faulty, replace the ignition coils with OEM or high-quality aftermarket parts.

4. Inspect Fuel Injectors

• If the ignition system is functioning properly, check for injector performance.
• Use a fuel injector cleaning kit to clean the injectors or replace them if they are clogged.

5. Check for Vacuum Leaks

• Inspect all vacuum lines for damages or disconnections.
• Use a smoke machine or carburetor cleaner to detect leaks.
• Replace any damaged hoses or fittings.

6. Perform Compression Test

• If misfire codes remain, perform a compression test on all cylinders.
• Ensure compression readings are within manufacturer specifications (typically 180-220 psi).
• Address any low compression issues by inspecting valves, piston rings, or gaskets.