what does it mean when my Toyota RAV4 XA50 (2019-2024) has a P0301 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool down before beginning work.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 1 using a socket set.
• Remove the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear or fouling. Replace with a new spark plug if needed (typically NGK or Denso brand).
• Torque the new spark plug to the manufacturer's specifications (usually around 13 lb-ft).

3. Check and Replace Ignition Coil

• Reconnect the ignition coil connector.
• If the ignition coil is suspected to be faulty, remove it by unscrewing the mounting bolts.
• Install a new ignition coil, ensuring it is properly seated and torqued to manufacturer specifications.
• Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Remove the fuel rail to access the injector for cylinder 1.
• Disconnect the fuel injector electrical connector and fuel line (be cautious of fuel spills).
• Remove the fuel injector and inspect for clogs. Clean it with a fuel injector cleaner or replace if necessary.
• Reinstall the fuel injector and reconnect the fuel line and electrical connector.

5. Compression Test

• Remove the spark plug from cylinder 1.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading. Compare it to manufacturer's specifications (typically around 150-200 psi).
• If compression is low, further investigation may be needed for potential valve or piston issues.