how to fix P0301 code on Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and materials.
• Disconnect the negative terminal of the battery to prevent electrical shock.
• Allow the engine to cool before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the ignition coil from cylinder 1 by unscrewing the bolts and gently pulling it out.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If necessary, replace the spark plug with a new one, ensuring it is gapped correctly per manufacturer specifications.
• Reinstall the ignition coil, securing it with bolts.

3. Test and Replace Ignition Coil

• Tools Required: Multimeter.
• With the ignition coil removed, test its resistance using a multimeter to ensure it is within the specified range.
• If the ignition coil is faulty, replace it with a new one.
• Reinstall the ignition coil and secure it properly.

4. Check and Replace Fuel Injector

• Tools Required: Fuel injector removal tool, torque wrench.
• Disconnect the fuel injector connector and the fuel line (be cautious of fuel spillage).
• Remove the fuel injector from cylinder 1 using the fuel injector removal tool.
• Inspect the injector for clogs or damage.
• If necessary, replace the fuel injector with a new one and ensure proper seating.
• Reconnect the fuel line and the injector connector.

5. Verify Engine Compression

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester and crank the engine; record the compression reading.
• Compare the reading to manufacturer specifications. If low, further diagnosis may be needed.