what does the P0301 code mean for my Toyota Corolla E170 (2013-2019)?

Solution

1. Preparation

• Gather tools and safety equipment.
• Disconnect the battery to prevent electrical shock.
• Ensure the engine is cool before starting work.

2. Inspect and Replace Spark Plug

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil connector for cylinder 1.
3. Remove the ignition coil by unscrewing the retaining bolts.
4. Remove the spark plug using a spark plug socket and ratchet.
5. Inspect the spark plug for wear, carbon buildup, or damage; replace if necessary.
6. Install the new spark plug by hand, then torque it to the manufacturer's specification (typically around 13-15 lb-ft).
7. Reinstall the ignition coil and reconnect the electrical connector.

3. Check and Replace Ignition Coil (if necessary)

1. If the ignition coil shows signs of damage or failure, replace it with a new one.
2. Ensure the new ignition coil is properly seated and connected.
3. Reconnect the battery.

4. Fuel Injector Inspection and Replacement (if necessary)

1. If the fuel injector is suspected to be faulty, remove the injector by detaching the fuel rail.
2. Replace the fuel injector with a new one, ensuring it is seated correctly in the rail.
3. Reattach the fuel rail and reconnect any electrical connectors.

5. Vacuum Leak Check

1. Inspect vacuum hoses for cracks or disconnections.
2. Use a smoke machine or carburetor cleaner to identify any leaks around the intake manifold.
3. Repair any identified leaks.