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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary.
• Locate and remove the spark plug wire or ignition coil for cylinder 1.
• Using a spark plug socket, remove the spark plug.
• Inspect the spark plug for carbon buildup, wear, or damage.
• Replace with a new spark plug (Manufacturer specified type, typically NGK or Denso).
• Torque the new spark plug to the manufacturer's specifications (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, proceed to check the ignition coil.
• Remove the ignition coil for cylinder 1 by unscrewing its mounting bolts.
• Disconnect the electrical connector from the ignition coil.
• Test the ignition coil's resistance using a multimeter; replace if it is outside manufacturer specifications.
• Install the new ignition coil and reconnect the electrical connector.
• Torque the mounting bolts to manufacturer specifications (usually around 7.5 lb-ft).

4. Compression Test

• If misfire persists, perform a compression test on cylinder 1.
• Remove the spark plug and insert the compression gauge into the spark plug hole.
• Crank the engine several times and note the compression reading.
• Compare the reading to manufacturer specifications; a significant drop indicates internal engine issues.

5. Inspect Fuel Injector

• Check the fuel injector for cylinder 1 by removing it from the rail.
• Inspect for clogs and test the injector's operation using a multimeter or injector tester.
• Clean or replace the injector as necessary.