how to fix P0301 code on Toyota Camry Eighth Generation (2018-present) with a rough idle

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Replace the Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil for cylinder 1 by unbolting and disconnecting the electrical connector.
• Remove the spark plug using the spark plug socket.
• Inspect the old spark plug for signs of wear or damage and compare it with the specifications for a new spark plug.
• Install the new spark plug hand-tight, then use a torque wrench to tighten to the manufacturer's specification (typically around 13-16 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace the Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coil shows signs of damage, remove it by unbolting it from the engine.
• Install the new ignition coil and secure it with bolts, tightening to the manufacturer's specifications (typically around 70-80 lb-in).
• Reconnect the electrical connector.

4. Clean or Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector cleaning kit or new fuel injector.
• If the fuel injector is clogged, use a cleaning kit to clean it according to manufacturer instructions, or if necessary, replace it with a new one.
• Reinstall the fuel injector and ensure it is seated properly in the intake manifold.

5. Reconnect Battery and Test

• Reconnect the negative terminal of the battery.
• Start the engine and allow it to reach operating temperature, observing for any abnormal sounds or behaviors.