how to fix P0301 code on my Toyota Camry XV70 (2018-2024)

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.
• Gather tools including a socket set, torque wrench, spark plug socket, multimeter, and compression tester.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear, carbon buildup, or damage; replace if necessary.
• Apply anti-seize compound on the threads of the new spark plug.
• Install the new spark plug and torque to the manufacturer’s specification (typically around 13-15 lb-ft).

3. Inspect and Replace Ignition Coil

• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Inspect the ignition coil for cracks or signs of overheating; replace if needed.
• Install the new ignition coil and reconnect the electrical connector. Ensure it clicks into place.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check for proper signal at the injector connector when the engine is cranking.
• If the injector is not functioning, replace it. Remove the fuel rail if necessary to access the injector.
• Install the new injector and reconnect the fuel rail and electrical connector.

5. Conduct Compression Test

• Remove the spark plug from cylinder 1 to access the combustion chamber.
• Install the compression tester into the spark plug hole.
• Crank the engine to take a reading; compare to the manufacturer's specifications. A reading below the specification may indicate internal engine issues.

6. Reassemble and Test

• Reinstall any components removed during the repair, including the engine cover.
• Reconnect the negative battery terminal.
• Start the engine and let it idle for a few minutes to ensure it runs smoothly.