how do I fix the P0301 code in my Toyota RAV4 Fourth Generation (2013-2018)?

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear or fouling. If damaged, replace with a new spark plug, ensuring it meets OEM specifications.
• Torque the new spark plug to manufacturer specifications (typically around 13-16 lb-ft).
• Reinstall the ignition coil.

3. Test and Replace Ignition Coil (if necessary)

• Tools Required: Multimeter (optional).
• If the spark plug is in good condition, test the ignition coil by swapping it with another cylinder. Clear the codes and recheck for misfire.
• If the code moves to the new cylinder, replace the faulty ignition coil.
• If not, the coil can be reinstalled.

4. Check Fuel Injector

• Tools Required: Fuel pressure gauge and injector cleaner.
• Use a fuel pressure gauge to check the fuel supply to cylinder 1.
• If the pressure is low, check the fuel filter and pump.
• If the fuel supply is adequate, remove the injector and clean it using an injector cleaner. Replace it if it is clogged or malfunctioning.

5. Verify Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and install the compression tester.
• Crank the engine and check the compression reading. A healthy cylinder should exhibit readings within the manufacturer's specified range (typically around 150-200 psi).
• If compression is low, further engine diagnostics may be necessary.