how to fix P0301 code in my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

1. Locate the spark plug for cylinder 1 (typically the first plug on the engine).
2. Remove the ignition coil by unscrewing it and disconnecting the electrical connector.
3. Using a spark plug socket, carefully unscrew the spark plug and remove it.
4. Inspect the old spark plug for signs of wear or fouling.
5. Install a new spark plug, ensuring it is gapped according to manufacturer specifications (typically around 0.044 inches for the Corolla).
6. Torque the spark plug to the manufacturer's specifications (approximately 13 lb-ft).

3. Replace Ignition Coil (if necessary)

1. If the ignition coil is found to be faulty during the diagnostic steps, proceed to replace it.
2. Remove the old ignition coil from cylinder 1 by unscrewing it and disconnecting the electrical connector.
3. Install the new ignition coil, ensuring it is seated properly.
4. Reconnect the electrical connector securely.

4. Clean or Replace Fuel Injector (if necessary)

1. If the fuel injector is not functioning properly, remove it by disconnecting the fuel line and electrical connector.
2. Clean the fuel injector using a specialized cleaner or replace it with a new one.
3. Reattach the fuel injector ensuring a proper seal.

5. Check for Vacuum Leaks

1. Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
2. Replace any damaged hoses to ensure proper vacuum levels.

Tools Required:

• OBD-II scanner
• Spark plug socket
• Multimeter
• Compression tester
• Torque wrench
• Screwdrivers
• Pliers

Parts Required:

• Spark plug (specific to Toyota Corolla)
• Ignition coil (if faulty)
• Fuel injector (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool completely before working on any components.