how to fix P0301 code in my Toyota Camry XV40 (2007-2011)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow engine to cool down to prevent burns.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge
• Remove the engine cover if necessary.
• Using a socket, remove the spark plug from cylinder 1.
• Inspect the old spark plug for fouling or wear, and compare with specifications.
• Install a new spark plug, ensuring it is properly gapped according to manufacturer specifications (typically around 0.043 inches).
• Torque the spark plug to the manufacturer-recommended specification (usually around 13 lb-ft).

3. Inspect/Replace Ignition Coil

• Tools Required: Socket set, multimeter (optional)
• Disconnect the electrical connector from the ignition coil on cylinder 1.
• Remove the ignition coil using a socket.
• Inspect the coil for cracks or damage. Use a multimeter to test for proper resistance if needed.
• Install a new ignition coil if the old one is faulty.
• Reconnect the electrical connector.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaner
• Disconnect the fuel injector connector for cylinder 1.
• Use a fuel pressure gauge to check fuel pressure; it should meet the manufacturer's specifications.
• If pressure is low, inspect the fuel pump and filter.
• Use an injector cleaner or replace the injector if it is clogged.

5. Final Assembly

• Reinstall any engine covers and reconnect the battery.
• Ensure all connections are secure.