how to fix the P0301 misfire code on my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before working on it.

2. Replace Spark Plug (if necessary)

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1:
  • Unscrew the fastening bolts.
  • Carefully disconnect the electrical connector.
• Remove the spark plug:
  • Use the spark plug socket to unscrew the spark plug from the cylinder head.
• Install the new spark plug:
  • Apply anti-seize lubricant on the threads (if recommended).
  • Torque the spark plug to specifications (typically around 13-16 ft-lbs).
• Reinstall the ignition coil:
  • Connect the electrical connector and secure it with bolts.

3. Check and Replace Ignition Coil (if necessary)

• Tools Required: Socket set.
• Remove the ignition coil from cylinder 1 as described in the previous step.
• Inspect the coil for cracks or signs of wear.
• Install a new ignition coil:
  • Position the coil in place and secure it with bolts.
  • Reconnect the electrical connector.

4. Clean or Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector cleaning kit or replacement injector.
• Disconnect the fuel injector connector.
• Remove the fuel rail (if applicable) to access the injector.
• Clean the injector using a cleaning kit or replace with a new injector.
• Reinstall the fuel rail and reconnect the injector.

5. Perform Compression Test (if necessary)

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare to specifications (typically 150-200 psi). If low, further investigation into mechanical issues is needed.