how to fix P0301 misfire code in Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the engine is cool to prevent burns.
• Disconnect the battery for safety.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the ignition coil from cylinder 1:
  • Unplug the electrical connector from the ignition coil.
  • Remove the mounting bolts using the socket set.
• Remove the spark plug:
  • Use the spark plug socket to carefully unscrew and remove the spark plug.
• Install the new spark plug:
  • Apply anti-seize compound (if required) to the threads.
  • Torque the spark plug to the manufacturer’s specification (typically around 13 lb-ft).
• Reinstall the ignition coil:
  • Place the ignition coil back into position and secure it with bolts.
  • Reconnect the electrical connector.

3. Test Ignition Coil

• Tools Required: Multimeter
• Test the ignition coil's resistance:
  • Measure the primary and secondary resistance according to specifications.
• If the ignition coil is faulty, replace it with a new one:
  • Follow the same steps as the spark plug replacement.

4. Inspect/Replace Fuel Injector

• Tools Required: Fuel injector removal tool, clean rags
• Remove the fuel rail to access the fuel injector:
  • Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
  • Disconnect fuel lines and electrical connectors from the injector.
  • Remove the mounting bolts and pull out the fuel rail with the injector.
• Clean or replace the fuel injector if clogged:
  • If cleaning, use an appropriate injector cleaner and follow instructions.
  • If replacing, install the new injector by reversing the removal steps.

5. Perform Compression Test

• Tools Required: Compression tester
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and note the compression reading:
  • Ensure it meets manufacturer specifications (typically 150-200 psi).
• If compression is low, further diagnostics may be needed for internal engine issues.