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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector cleaner.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plugs

• Remove the ignition coil covers if applicable.
• Disconnect the ignition coils and remove them using a socket.
• Remove the old spark plugs with a spark plug socket.
• Install new spark plugs with the specified gap (refer to manufacturer specifications).
• Reinstall the ignition coils and covers.

3. Inspect and Replace Ignition Coils

• Remove the ignition coils as per the previous step.
• Visually inspect for cracks or damage; test with a multimeter if necessary.
• Replace any faulty ignition coils with new ones, ensuring they are seated properly.
• Reconnect the ignition coils.

4. Clean or Replace Fuel Injectors

• If injectors are suspected to be clogged, use a fuel injector cleaner or remove and clean them.
• For replacement, disconnect the fuel lines and electrical connectors from the injectors.
• Remove the old injectors and install new ones, ensuring proper alignment and seating.
• Reconnect fuel lines and electrical connectors.

5. Perform Compression Test

• Remove spark plugs and insert compression tester into each cylinder.
• Crank the engine and take readings; compare to manufacturer specifications.
• Address any cylinders with low compression through repairs or rebuilds as necessary.

6. Check for Vacuum Leaks

• Inspect all hoses, gaskets, and the intake manifold for leaks.
• Use a smoke test or carburetor cleaner to identify any vacuum leaks.
• Replace any damaged hoses or gaskets identified during the inspection.