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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Remove the ignition coil covers if applicable.
• Using a ratchet and socket, remove the spark plugs from the cylinder head.
• Inspect the spark plugs for wear; replace if necessary.
• Install new spark plugs, ensuring the correct gap (typically 0.044 inches for Tacoma).
• Torque the spark plugs to the manufacturer specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coils

• Remove the ignition coils from the spark plugs.
• Check for any visible damage or corrosion on the coils.
• If damaged, replace the ignition coils with new ones.
• Reinstall the ignition coils, ensuring they are seated properly.

4. Check Fuel System

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "On" position without starting the engine and check the pressure.
• Ensure it meets specifications (typically around 50-60 psi for Tacoma).
• If pressure is low, inspect the fuel filter and fuel pump for issues. Replace if necessary.

5. Inspect Vacuum and Intake Manifold

• Check all vacuum lines for cracks or disconnections.
• Remove the intake manifold if necessary to inspect for leaks around the gaskets.
• Replace any damaged vacuum hoses or intake gaskets.

6. Perform Compression Test

• Remove spark plugs and disable the ignition system.
• Insert a compression gauge into each cylinder.
• Crank the engine and record the compression readings.
• Compare readings against manufacturer specifications (generally around 170 psi for Tacoma).