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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before beginning work.

2. Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from the cylinder 1 coil.
  3. Remove the ignition coil using a socket and set it aside.
  4. Remove the spark plug using a spark plug socket.
  5. Inspect the spark plug for signs of wear (fouling, excessive wear) and replace if necessary.
  6. Apply a small amount of dielectric grease to the ignition coil boot and reinstall the coil.
  7. Reconnect the ignition coil connector.

3. Fuel Injector Inspection and Replacement

• Tools Required: Fuel injector removal tool (if needed), socket set, torque wrench.
• Sub-steps:
  1. Relieve the fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
  2. Disconnect the fuel line from the fuel rail and remove any clips securing the injector.
  3. Remove the fuel injector from the rail, inspecting the O-rings for damage.
  4. If the injector appears clogged, clean it or replace it with a new one.
  5. Reinstall the fuel injector with new O-rings and reconnect the fuel line.

4. Compression Test (If Needed)

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove the ignition coil and spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds and record the compression reading.
  4. Compare the reading to manufacturer specifications. If low, further investigation is needed for potential valve or piston issues.

5. Reassemble and Check

• Reinstall any removed components in reverse order.
• Reconnect the negative battery terminal.