how to clear a P0301 code on my Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative terminal of the battery for safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil cover if applicable.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Unscrew and remove the spark plug.
• Inspect the spark plug for wear or fouling. Replace it if necessary.
• Install the new spark plug and torque to the manufacturer’s specifications (typically around 13-16 ft-lbs).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, proceed to inspect the ignition coil.
• Tools Required: Socket set
• Remove the ignition coil from cylinder 1.
• Test the coil with a multimeter (should show the specified resistance as per the service manual).
• Replace the ignition coil if it is faulty, ensuring it is properly seated before reconnecting the connector.

4. Check and Replace Fuel Injector

• If the ignition components are functioning correctly, check the fuel injector.
• Tools Required: Fuel pressure gauge, multimeter
• Disconnect the fuel injector connector and test the injector with a noid light to ensure it is receiving a signal.
• If the injector is faulty, replace it by removing the fuel rail and replacing the injector, then reassemble it.

5. Compression Test

• If the misfire persists, perform a compression test on cylinder 1.
• Tools Required: Compression tester
• Remove the spark plug and install the compression tester.
• Crank the engine and take the reading. Compare it with specifications.
• If compression is low, further investigation into engine internals may be necessary.

6. Reassemble and Clear Codes

• Reinstall any removed components in the reverse order.
• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code from the vehicle’s memory.