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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and disconnect the negative battery terminal.
• Tools Required: Socket set, torque wrench, compression tester, OBD-II scanner.

2. Replace Spark Plug

1. Remove Engine Cover (if applicable)

   • Unscrew any fasteners holding the cover.
   • Gently lift off the cover and set it aside.

2. Remove Ignition Coil

   • Unscrew the bolts securing the ignition coil on cylinder 1.
   • Disconnect the electrical connector from the ignition coil.
   • Gently pull the ignition coil out of the spark plug well.

3. Remove Old Spark Plug

   • Use a spark plug socket to unscrew and remove the old spark plug from cylinder 1.
   • Inspect the old spark plug for signs of damage or wear.

4. Install New Spark Plug

   • Apply a small amount of anti-seize lubricant on the threads of the new spark plug.
   • Hand-tighten the spark plug into the cylinder head, then use a torque wrench to tighten it to the manufacturer’s specified torque (typically around 13-16 lb-ft).

3. Inspect and Replace Ignition Coil (if necessary)

1. Inspect Ignition Coil

   • Check the ignition coil for cracks or wear. If damaged, proceed to replace it.

2. Install New Ignition Coil

   • Place the new ignition coil into the spark plug well.
   • Reconnect the electrical connector and secure with bolts to the specified torque.

4. Clean or Replace Fuel Injector (if necessary)

1. Remove Fuel Injector

   • Disconnect the fuel line (be cautious of fuel pressure).
   • Unscrew and remove the retaining clips for the fuel injector.
   • Pull out the fuel injector from the rail.

2. Clean or Replace Injector

   • If cleaning, use a fuel injector cleaning kit as per the manufacturer's instructions.
   • If replacing, install the new injector into the fuel rail and secure with clips.

5. Reassemble and Test

• Reattach the engine cover.
• Reconnect the negative battery terminal.
• Start the engine and allow it to idle for a few minutes.