how to fix the P0305 misfire code on a Toyota Tacoma N300 (2016-Present)?

Learn how to diagnose and fix P0305 cylinder 5 misfire in Toyota Tacoma N300. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 5 using a socket wrench.
• Extract the spark plug using a spark plug socket.
• Check the spark plug for signs of wear, fouling, or damage.
• If necessary, replace the spark plug with a new one (refer to specifications for the correct type).
• Reinstall the ignition coil and securely fasten it.

3. Test and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil with a multimeter (primary and secondary resistance).
• If the ignition coil is faulty, replace it with a new one.
• Ensure the new ignition coil is compatible with the vehicle’s specifications.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 5.
• Use a noid light to verify that the injector is receiving a signal.
• If the injector is not functioning, replace it with a new one.

5. Address Vacuum Leaks

• Inspect vacuum hoses around the intake manifold, throttle body, and any associated gaskets.
• Replace any damaged or cracked hoses and re-seal any leaky gaskets.

6. Reassemble and Test

• Reconnect all components that were removed.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.
• Monitor for any check engine light and ensure the misfire code does not reappear.