how to fix P0301 misfire code in Toyota Highlander Third Generation (2014-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the battery to prevent any electrical hazards.

2. Replace Spark Plug

• Sub-step 1: Remove the engine cover if applicable.
• Sub-step 2: Locate cylinder 1 spark plug (typically the front left).
• Sub-step 3: Use a socket wrench and spark plug socket to remove the old spark plug.
• Sub-step 4: Check the gap on the new spark plug and adjust it to manufacturer specifications (usually around 0.044 inches).
• Sub-step 5: Install the new spark plug and torque it to the manufacturer’s specifications (typically around 13 lb-ft).

3. Replace Ignition Coil

• Sub-step 1: Remove the ignition coil bolt and disconnect the electrical connector.
• Sub-step 2: Pull the ignition coil out of the cylinder head.
• Sub-step 3: Install the new ignition coil, ensuring it is seated properly.
• Sub-step 4: Reconnect the electrical connector and secure the coil with the bolt.

4. Check Fuel Injector

• Sub-step 1: Use a fuel injector cleaner or test fuel injector operation with a multimeter.
• Sub-step 2: If the injector is faulty, remove it from the engine.
• Sub-step 3: Install a new fuel injector, ensuring proper sealing.

5. Reassemble and Reconnect Battery

• Replace any components removed during the repair (e.g., engine cover).
• Reconnect the vehicle battery.