how to fix P0301 misfire code on Toyota Camry XV40 (2007-2011)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the ignition coil covering from cylinder 1.
• Disconnect the ignition coil connector and remove the ignition coil.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for fouling, wear, or damage. Replace if necessary.
• Check the gap on the new spark plug and adjust to manufacturer specifications (0.043 inches).
• Install the new spark plug and tighten to the manufacturer's torque specification (typically 13 ft-lbs).

3. Inspect and Replace Ignition Coil

• Reinstall the ignition coil if it was in good condition; otherwise, replace it.
• Tools Required: Socket set.
• If replacing, install the new ignition coil and reconnect the electrical connector.
• Ensure the coil is seated properly and secured with the retaining bolt.

4. Check Fuel Injector

• Inspect the fuel injector electrical connector for damage.
• Test the injector using a multimeter to ensure it is receiving the correct voltage.
• If needed, remove and clean the fuel injector or replace it if faulty.
• Tools Required: Fuel injector cleaning kit (if cleaning), or a replacement injector.
• Reinstall the injector and ensure it clicks securely into place.

5. Verify Vacuum Leaks

• Inspect vacuum hoses and intake manifold gaskets for cracks or damage.
• Use a smoke machine or carburetor cleaner to confirm the absence of leaks.
• Repair or replace any damaged components found.