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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal for safety.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Detach the ignition coil and spark plug wire from cylinder 1.
• Use a spark plug socket to remove the spark plug.
• Inspect the spark plug for signs of wear, fouling, or damage.
• Replace with a new spark plug (OEM recommended type).
• Torque the new spark plug to manufacturer specifications (typically 13 lb-ft).

3. Test and Replace Ignition Coil

• Reconnect the ignition coil to the new spark plug.
• If misfire persists, remove the ignition coil and test its resistance with a multimeter.
• Replace the ignition coil if the resistance is out of specification (typically around 0.4 to 0.6 ohms).
• Reinstall the ignition coil and ensure proper connection.

4. Check Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check for pulse signal when cranking the engine.
• If no signal is present, inspect wiring and connectors.
• If the injector is faulty, remove it and replace it with a new one, ensuring proper O-ring installation.

5. Compression Test

• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• Compare with manufacturer specifications (typically around 180-200 psi).
• If compression is low, further diagnosis is needed for potential internal engine issues.

6. Final Inspection

• Reconnect all components and ensure all connections are secure.
• Reattach the negative battery terminal.