what does it mean if my Toyota RAV4 Fifth Generation (2019-present) has a P0301 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool before beginning work.
• Disconnect the negative battery cable to avoid electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1.
• Unscrew and remove the spark plug using a spark plug socket.
• Check the spark plug for wear or damage and replace it if necessary.
  • Tool Required: Spark plug socket, ratchet, torque wrench
  • Torque Specification: 13 lb-ft (17.6 Nm) for spark plugs
• Reinstall the ignition coil after ensuring it is functioning properly.

3. Test and Replace Ignition Coil (if necessary)

• If the spark plug appears fine, test the ignition coil for faults using a multimeter.
• If the ignition coil is faulty, disconnect the wiring harness and remove the coil.
• Install the new ignition coil and reconnect the wiring harness.

4. Check and Replace Fuel Injector (if necessary)

• Disconnect the fuel injector connector and remove the fuel rail.
• Test the fuel injector for proper operation with a noid light or multimeter.
• Replace the injector if it is faulty, then reinstall the fuel rail and reconnect the wiring.

5. Compression Test

• Remove the spark plug and connect a compression gauge to the cylinder 1 spark plug hole.
• Crank the engine and record the compression reading.
• If the compression is low, further investigation is required to check for internal engine issues.