what does code P0301 mean on my Toyota Highlander Third Generation (2014-2019)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1.
• Unscrew and remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear (e.g., carbon buildup, damage).
• If necessary, replace with a new spark plug, ensuring the gap is set to manufacturer specifications (typically around 0.044 inches).
• Reinstall the spark plug and torque it to the manufacturer’s specifications (usually around 13 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set
• Remove the ignition coil from cylinder 1.
• Inspect the coil for cracks or failures.
• If faulty, replace with a new ignition coil.
• Reinstall the ignition coil securely.

4. Inspect and Clean or Replace Fuel Injector

• Tools Required: Fuel injector cleaning kit (if cleaning), socket set
• Remove the fuel injector from cylinder 1.
• If cleaning, use a fuel injector cleaning kit to clean the injector thoroughly.
• If replacement is necessary, install a new fuel injector.
• Reinstall any components removed during the process.

5. Reconnect Battery and Clear Codes

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0301 code from the system.