how to fix P0301 misfire code in my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely before starting work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1:
  • Disconnect the electrical connector.
  • Remove the bolts holding the coil in place using a socket set.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for fouling or wear; replace if necessary.
• Install the new spark plug and torque it to the manufacturer's specification (typically around 13-15 ft-lbs).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil:
  • Look for cracks or carbon tracking.
• Replace the ignition coil if damaged:
  • Install the new coil and reconnect the electrical connector.
  • Secure the coil with bolts, ensuring proper torque.

4. Check and Repair Vacuum Leaks

• Inspect vacuum lines around the intake manifold and throttle body for cracks or disconnections.
• Replace any damaged vacuum lines as needed.

5. Fuel Injector Cleaning/Replacement

• If the ignition system is functioning properly, check fuel injector performance:
  • Use a fuel injector cleaner or replace the injector for cylinder 1 if clogged.
• Confirm proper reinstallation and connections.