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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket set to unscrew the spark plugs.
• Inspect each spark plug for signs of wear, carbon buildup, or damage.
• Replace any faulty spark plugs with OEM-spec plugs, ensuring the gap is set to manufacturer specifications.
• Reinstall spark plugs and torque to the recommended specification (usually around 13-15 lb-ft).

3. Check and Replace Ignition Coils

• Remove the ignition coil connectors carefully.
• Unscrew the ignition coils and take them out.
• Test each coil with a multimeter (check for resistance according to manufacturer specifications).
• Replace any faulty ignition coils with high-quality replacements.
• Reinstall the ignition coils and reconnect the connectors.

4. Fuel System Inspection

• Use a fuel pressure gauge to check the fuel pressure at the rail. It should match manufacturer specifications (typically 50-60 psi).
• If pressure is low, inspect the fuel pump and fuel filter for clogs or malfunctions.
• Replace the fuel filter if it hasn’t been changed according to the maintenance schedule.

5. Vacuum Leak Inspection

• With the engine running, use a smoke machine or carb cleaner to locate any vacuum leaks along hoses and the intake manifold.
• Repair any leaks found by replacing cracked hoses or resealing the intake manifold.

6. Compression Test

• Perform a compression test on all cylinders using a compression tester.
• Compare results to manufacturer specifications (usually around 180-200 psi).
• If compression is low in any cylinder, further investigation into the engine internals may be necessary.