how to fix P0301 code in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Safety: Disconnect the battery before working on electrical components.

2. Replace Ignition Components

1. Remove the Engine Cover (if applicable)
   • Tools: Socket set, ratchet.
   • Unscrew and remove any bolts securing the engine cover.
2. Remove Spark Plug
   • Tools: Spark plug socket, ratchet, extension.
   • Disconnect the ignition coil connector.
   • Remove the ignition coil bolts and take out the ignition coil.
   • Use the spark plug socket to unscrew and remove the spark plug from cylinder 1.
3. Inspect and Replace the Spark Plug
   • Check the spark plug for wear, carbon buildup, or damage.
   • If damaged, replace with a new spark plug (use OEM specifications).
   • Torque the new spark plug to the manufacturer’s specified value (typically around 13-15 lb-ft).
4. Replace the Ignition Coil (if necessary)
   • If the ignition coil shows signs of damage or malfunction, replace it with a new unit.
   • Torque the ignition coil bolts to the specified value (usually around 8-10 lb-ft).

3. Check and Replace Fuel Injector (if necessary)

1. Access Fuel Injectors
   • Remove any components obstructing access to the fuel rail.
   • Tools: Socket set, screwdriver.
2. Remove the Fuel Injector
   • Disconnect the electrical connector from the fuel injector.
   • Carefully unclip and remove the fuel rail bolts to access the injector.
   • Pull out the faulty fuel injector from the rail.
3. Install New Fuel Injector
   • Lubricate the O-rings of the new injector with engine oil.
   • Install the new injector into the fuel rail and secure it.
   • Reattach the fuel rail and torque to manufacturer specifications.

4. Perform a Final Inspection

• Recheck all connections and ensure everything is secure.
• Reattach the engine cover if it was removed.