how to fix P0300 code on my Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool before beginning any work.

2. Inspect and Replace Spark Plugs

• Remove the ignition coils following the manufacturer's instructions.
• Use a spark plug socket to remove the spark plugs.
• Inspect the spark plugs for wear and replace them if necessary (gaps should be set according to manufacturer specifications).
• Reinstall the new or inspected spark plugs and reattach the ignition coils, ensuring they are securely seated.

3. Check and Replace Ignition Coils

• If the ignition coils show signs of damage or wear, remove them from the engine.
• Replace faulty ignition coils with OEM or high-quality aftermarket parts.
• Ensure proper torque specifications are followed when reinstalling coils.

4. Test Fuel System

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (do not start the engine) to check for fuel pressure.
• Compare the reading to the specifications in the service manual; replace the fuel pump or filter if pressure is low.

5. Inspect for Vacuum Leaks

• Use a smoke machine or carburetor cleaner to check for vacuum leaks around hoses and intake manifold.
• Replace any damaged hoses or gaskets discovered during inspection.

6. Compression Test

• Remove the spark plugs to facilitate compression testing.
• Insert the compression gauge into the spark plug hole for each cylinder.
• Crank the engine and record the compression readings; compare them to the manufacturer's specifications.
• Address any cylinders with low compression as necessary (this may involve further engine disassembly).