my Toyota RAV4 XA50 (2019-2024) has a check engine light and runs rough

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, multimeter, vacuum gauge.
• Disconnect the negative battery terminal to ensure safety while working on the vehicle.

2. Address Error Codes

• Use the OBD-II scanner to retrieve and note any error codes.
• Research codes to determine affected components (e.g., P0300 for random misfire).

3. Replace Spark Plugs (if necessary)

• Remove the engine cover (if applicable) to access spark plugs.
• Using a socket set, gently remove each spark plug, inspecting for wear or damage.
• Install new spark plugs, ensuring proper gap settings according to manufacturer specifications. Torque to the specified value (typically 13-15 lb-ft).

4. Check and Replace Air Filter

• Locate the air filter housing and open it.
• Remove the existing air filter and inspect it for dirt and restrictions.
• Install a new air filter, ensuring it seats correctly in the housing.

5. Inspect and Repair Vacuum Leaks

• Use a vacuum gauge to check for correct manifold pressure.
• Inspect vacuum hoses for cracks or disconnections; replace any damaged hoses.

6. Fuel System Check

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (without starting) to check fuel pressure.
• If pressure is below specifications, consider replacing the fuel pump or filter.