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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil:
  • Unscrew and detach the electrical connector from the ignition coil.
  • Remove the bolts securing the ignition coil and take it out.
• Remove the spark plug:
  • Use a spark plug socket to unscrew and remove the old spark plug.
• Install the new spark plug:
  • Apply anti-seize compound to the threads of the new spark plug.
  • Hand-tighten the spark plug, then use a torque wrench to tighten to the manufacturer’s specifications (typically around 13-16 lb-ft).

3. Replace Ignition Coil

• Tools Required: Socket set
• Remove the faulty ignition coil (if applicable):
  • Follow the same steps as above to detach the ignition coil.
• Install the new ignition coil:
  • Position the new ignition coil over the spark plug and secure it with bolts.
  • Reconnect the electrical connector ensuring it clicks into place.

4. Fuel Injector Check

• Tools Required: Fuel pressure gauge (if testing fuel pressure)
• Remove the fuel injector connector for cylinder 1.
• Use a multimeter to check for proper resistance in the fuel injector. If resistance is outside the specified range, replace the injector.
• If no replacement is needed, clean the injector using a fuel injector cleaner or replace if clogged.

5. Vacuum Leak Inspection

• Inspect all vacuum lines and the intake manifold for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks by observing for changes in engine RPM.