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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 using a socket set.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear; replace if necessary with a new spark plug (OEM recommended).
• Torque the new spark plug to the manufacturer's specification (typically around 13-16 lb-ft).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coil

• If the spark plug is in good condition but the misfire persists, test the ignition coil using a multimeter:
  • Check primary and secondary resistance according to specifications.
• If the ignition coil is faulty, replace it with a new coil (OEM recommended).
• Reinstall the ignition coil and reconnect the wiring harness.

4. Check and Replace Fuel Injector

• If the ignition system is functioning correctly, inspect the fuel injector for cylinder 1.
• Disconnect the fuel injector connector and test the injector’s resistance with a multimeter.
• If it’s out of spec, replace the fuel injector with a new one (OEM recommended).
• Reconnect the fuel injector connector.

5. Perform Compression Test (if necessary)

• If the issue still exists, perform a compression test on cylinder 1:
  • Remove the spark plug and insert the compression gauge.
  • Crank the engine and record the compression reading.
• If compression is low, further diagnosis is needed for potential internal engine issues.