how to fix P0301 misfire code on my Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

1. Gather Tools and Parts: Collect necessary tools and replacement parts.
2. Safety Precautions: Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

1. Remove Engine Cover (if applicable):
   • Use a socket set to remove bolts securing the engine cover.
2. Access Spark Plug:
   • Locate the spark plug in cylinder 1.
   • Remove the ignition coil connector by pressing on the tab and pulling it out.
3. Remove Ignition Coil:
   • Unscrew the ignition coil from the cylinder head using a socket.
   • Carefully pull out the ignition coil.
4. Remove Spark Plug:
   • Use a spark plug socket and ratchet to unscrew the spark plug.
   • Inspect the spark plug for wear or fouling.
5. Install New Spark Plug:
   • Apply anti-seize compound to the threads of the new spark plug (if applicable).
   • Hand-tighten the spark plug, then use a torque wrench to tighten to manufacturer specifications (typically 13-16 lb-ft).
6. Reinstall Ignition Coil:
   • Place the ignition coil back into the cylinder head and secure it with bolts.
   • Reconnect the ignition coil connector.

3. Inspect and Replace Fuel Injector (if necessary)

1. Remove Intake Manifold (if required for access):
   • Disconnect air intake duct and any components obstructing access to the fuel rail.
   • Remove bolts securing the intake manifold and carefully lift it off.
2. Remove Fuel Injector:
   • Disconnect the electrical connector from the fuel injector.
   • Use a fuel line disconnect tool to relieve fuel pressure, then remove the fuel rail bolts.
   • Lift the fuel rail away from the engine and remove the injector from the rail.
3. Install New Fuel Injector:
   • Lubricate the O-rings on the new fuel injector with engine oil.
   • Insert the new injector into the fuel rail and reattach the rail to the engine.
4. Reassemble Intake Manifold (if removed):
   • Reinstall the intake manifold and secure it with bolts.

4. Clear Codes and Test

1. Reconnect Battery: Restore the negative battery terminal.
2. Clear the Engine Codes: Use an OBD-II scanner to clear the P0301 code.
3. Test Drive: Monitor vehicle performance for any recurrence of misfire codes.