how to fix P0301 misfire code in my Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather tools and ensure proper workspace.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Tools required: OBD-II scanner, socket set, multimeter, compression tester, torque wrench.

2. Replace Spark Plug

• Remove the engine cover if necessary.
• Locate cylinder 1 spark plug (typically the front left).
• Use a socket set to remove the spark plug.
• Inspect the old spark plug and replace it with a new one if damaged or worn.
• Torque the new spark plug to manufacturer specifications (usually around 13-15 ft-lbs).
• Reconnect any components removed for access.

3. Test and Replace Ignition Coil

• Disconnect the ignition coil connector on cylinder 1.
• Remove the ignition coil using the appropriate socket.
• Use a multimeter to test the primary and secondary resistance of the coil.
• If the coil is faulty, replace it with a new one.
• Reinstall the ignition coil and reconnect the connector.

4. Inspect and Test Fuel Injector

• Locate the fuel injector for cylinder 1.
• Disconnect the fuel injector connector.
• Use a noid light to check if the injector is receiving a signal.
• If the injector is not clicking, replace it with a new one.
• Reconnect the fuel injector and connector.

5. Perform Compression Test

• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• If the compression is below specifications (typically 120-180 psi), further diagnosis of the engine internals may be necessary.