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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, ratchet, spark plug socket, dielectric grease.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the electrical connector from the ignition coil for cylinder 1.
  3. Remove the ignition coil using a socket set.
  4. Check the spark plug for wear; if needed, remove it using a spark plug socket.
  5. Replace the spark plug with a new one, ensuring it meets the manufacturer’s specifications for gap and type.
  6. Apply dielectric grease to the ignition coil connector and reinstall the ignition coil.
  7. Torque the ignition coil to the manufacturer’s specification.

3. Check and Replace Fuel Injector (if necessary)

• Tools Required: Noid light, socket set, fuel injector puller.
• Sub-steps:
  1. Disconnect the electrical connector from the fuel injector for cylinder 1.
  2. Use a noid light to check for proper signal to the injector. If no pulse is detected, further diagnose the electrical circuit.
  3. If the injector is faulty, remove it using a fuel injector puller.
  4. Install the new fuel injector, ensuring it is seated properly and replacing any O-rings if necessary.
  5. Reconnect the fuel injector electrical connector.

4. Perform Compression Test

• Tools Required: Compression gauge.
• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression gauge into the spark plug hole.
  3. Crank the engine several times to obtain a reading.
  4. Compare the reading to the manufacturer's specifications. If the compression is low, further investigation into the engine internals is needed.

5. Reassemble and Reconnect

• Reinstall any components removed during the procedure, ensuring all connections are secure.
• Reconnect the negative battery terminal.