how to fix the engine misfire in my Toyota Corolla E140 (2006-2013) with P0303 code

Learn how to diagnose and fix P0303 cylinder 3 misfire in Toyota Corolla E140. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on the engine.

2. Remove Ignition Components

• Tools Required: Socket set, torque wrench
• Remove the engine cover if applicable using the socket set.
• Disconnect the ignition coil connector for cylinder 3.
• Remove the ignition coil from cylinder 3 by unscrewing it and carefully lifting it out.
• Remove the spark plug from cylinder 3 using a spark plug socket.

3. Inspect and Replace Components

• Check the spark plug for damage or excessive wear. Replace it if necessary with a new spark plug that meets the manufacturer's specifications.
• Inspect the ignition coil for any cracks or damage. Replace it if needed.
• Test the fuel injector for cylinder 3. If it's faulty, replace it with a new injector.

4. Reassemble Components

• Tools Required: Torque wrench
• Install the new or inspected spark plug into cylinder 3 and torque it to the manufacturer's specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect its electrical connector.
• Replace the engine cover if it was removed.

5. Final Checks

• Reconnect the battery.
• Erase the trouble codes using the OBD-II scanner.