2009-2013 Toyota Corolla SPARK PLUG CHANGE | P0301 & P0303 Check Engine Code

How to Change Spark Plugs in a Toyota Corolla (2009-2013)

If you're experiencing issues like oil leaks, misfires, or specific engine codes like P0301 & P0303 in your Toyota Corolla, it might be time to change the spark plugs. Follow these steps to successfully change the spark plugs in your vehicle.

Tools Required:

• 10mm socket and ratchet
• 9/16 spark plug socket
• 6-inch extension

Step 1: Preparation

1. Start by lifting the hood of your Toyota Corolla.
2. Locate the ignition coils on top of the engine. These are directly above the spark plugs.
3. Identify the problematic cylinder based on the engine code you're getting (e.g., P0301 or P0303).

Step 2: Removing Ignition Coil

1. Use a 10mm socket and ratchet to loosen the bolt securing the ignition coil.
2. Unclip the electrical connector from the ignition coil.
3. Remove the ignition coil from the cylinder by pulling it out.

Step 3: Preparing Spark Plugs

1. Before removing the spark plugs, apply an anti-seize lubricant on the threads. This prevents corrosion and helps in easy removal in the future.
2. Repeat this process for all four spark plugs.

Step 4: Removing and Replacing Spark Plugs

1. Use the 9/16 spark plug socket with the 6-inch extension to reach and remove the spark plug.
2. Inspect the old spark plug for any signs of issues like oil residue or excessive wear.
3. Insert the new spark plug into the socket and hand-tighten it into the cylinder head.
4. Use the socket wrench to tighten the spark plug to the specified torque (snug tight).

Step 5: Reinstalling Ignition Coil

1. Place the ignition coil back into the cylinder.
2. Reattach the electrical connector to the ignition coil.
3. Repeat the same process for all spark plugs and ignition coils in each cylinder.

Step 6: Final Checks

1. Ensure all spark plugs are securely tightened.
2. Double-check the connections of the ignition coils.
3. Close the hood of your Toyota Corolla.

Congratulations! You have successfully changed the spark plugs in your Toyota Corolla. This maintenance task can help improve engine performance and fuel efficiency. If you have any questions or encounter any issues, feel free to seek assistance from a professional mechanic.