how to fix P0302 code in my Toyota Corolla E140 (2006-2013)

Solution

1. Preparation

• Gather 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.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Fuel injector cleaning kit (if needed)

2. Replace Spark Plug and Ignition Coil

1. Remove Engine Cover (if applicable)

   • Use a socket set to remove any bolts securing the engine cover.
   • Carefully lift the cover and set it aside.

2. Remove Spark Plug

   • Locate the spark plug in cylinder 2 (refer to the vehicle’s manual for exact location).
   • Use a spark plug socket to unscrew and remove the spark plug.
   • Inspect the spark plug for wear, carbon buildup, or damage.

3. Replace Ignition Coil

   • Disconnect the electrical connector from the ignition coil.
   • Remove the ignition coil retaining screws and lift it out.
   • Install the new ignition coil and secure it with screws.
   • Reconnect the electrical connector.

4. Install New Spark Plug

   • Apply a small amount of anti-seize compound to the threads of the new spark plug.
   • Hand-tighten the spark plug into the cylinder and then torque it to the manufacturer’s specifications (typically around 13-15 lb-ft).

3. Inspect and Clean Fuel Injector

1. Access Fuel Injector

   • Remove any necessary components to gain access to the fuel injector for cylinder 2.

2. Test Fuel Injector

   • Use a multimeter to check the resistance of the fuel injector. Compare the reading to manufacturer specifications.

3. Clean or Replace Fuel Injector

   • If cleaning, use a fuel injector cleaning kit following the product instructions.
   • If replacing, remove the old injector and install the new one, ensuring it is properly seated.

4. Compression Test (if needed)

1. Remove Spark Plug

   • Remove the spark plug from cylinder 2 again if it was previously installed.

2. Connect Compression Tester

   • Install the compression tester into the spark plug hole.

3. Crank Engine

   • Have an assistant crank the engine for a few seconds while you observe the gauge.
   • Record the compression reading and compare it with specifications (typically 180-200 psi).

5. Reassemble and Reconnect Battery

• Reinstall any components removed during the repair.
• Reconnect the negative battery terminal securely.
• Start the engine to check for proper operation.