how to fix P0300 engine code in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Replace Spark Plugs

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coils by pulling off the electrical connectors.
3. Unscrew the ignition coils and remove them from the spark plug holes.
4. Use a spark plug socket to remove the old spark plugs.
5. Inspect and gap the new spark plugs according to manufacturer specifications.
6. Install the new spark plugs and torque them to the specified value (usually 13-15 lb-ft).
7. Reinstall the ignition coils and reconnect their electrical connectors.

3. Test Ignition Coils

1. Using a multimeter, check the resistance of each ignition coil according to the specifications in the service manual.
2. If any coil is out of range, replace it with a new one.

4. Inspect Fuel Injectors

1. Remove the fuel rail by unscrewing the bolts and disconnecting the fuel line (be cautious of fuel spillage).
2. Inspect the injectors for clogs; clean or replace them if necessary.
3. Reinstall the fuel rail ensuring proper alignment and torque the bolts to specifications.

5. Check for Vacuum Leaks

1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
2. If leaks are found, replace damaged hoses or reattach loose connections.
3. Optionally, perform a smoke test to confirm there are no hidden leaks.