how to fix P0301 code in Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, fuel injector tester, multimeter.
• Disconnect the battery negative terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from Cylinder 1.
• Use a socket set to remove the spark plug.
• Inspect the spark plug for wear or fouling. If damaged, replace with a new spark plug (NGK or Denso recommended).
• Torque the new spark plug to the manufacturer's specifications (typically around 13 lb-ft).
• Reinstall the ignition coil and connect the wiring harness.

3. Test and Replace Ignition Coil (if necessary)

• Use a multimeter to test the ignition coil resistance. Refer to service manual specifications for acceptable resistance values.
• If the ignition coil is out of spec, replace it with a new one.
• Ensure the new coil is properly seated and connected.

4. Inspect and Repair Vacuum Leaks

• Visually inspect hoses and gaskets around the intake manifold for cracks or disconnections.
• Use carburetor cleaner to spray around suspected areas while the engine runs; if RPM changes, a leak is present.
• Replace any faulty hoses or gaskets identified during inspection.

5. Compression Test

• Remove the spark plug from Cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine.
• Compare the compression reading to the manufacturer's specifications (typically 170-200 psi).
• If the compression is low, further investigation into the piston rings or valves may be required.

6. Fuel Injector Check

• Use a fuel injector tester to check the operation of the Cylinder 1 injector.
• If the injector is not functioning correctly, remove and replace it with a new injector.
• Ensure proper seating and connection of the injector.