how to fix P0301 code for my Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the engine is cool and disconnect the negative battery terminal for safety.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Disconnect the ignition coil connector.
  3. Remove the ignition coil from cylinder 1.
  4. Remove the old spark plug using the spark plug socket.
  5. Install the new spark plug, ensuring it is gapped correctly (typically 0.043 inches for the Corolla).
  6. Torque the spark plug to the manufacturer's specification (usually around 13 lb-ft).
  7. Reinstall the ignition coil and reconnect the connector.

3. Test Ignition Coil

• Tools Required: Multimeter.
• Sub-steps:
  1. Disconnect the ignition coil connector.
  2. Measure the resistance across the primary and secondary terminals of the ignition coil.
  3. Compare readings to specifications; replace if out of range.
  4. Reconnect the ignition coil if it passes the test.

4. Inspect Fuel Injector

• Tools Required: Fuel pressure gauge, injector cleaning kit (if required).
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check fuel pressure; it should meet specifications.
  3. If pressure is low, check for clogged filters or faulty injectors.
  4. If necessary, clean the fuel injector with the cleaning kit or replace if faulty.

5. Perform Compression Test

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester.
  3. Crank the engine for a few seconds and record the pressure reading.
  4. Compare with manufacturer specifications (usually around 180-200 psi).
  5. If compression is low, diagnose further for potential internal engine issues.