what causes the engine light to stay on in my Toyota RAV4 XA50 (2019-2024)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is turned off.
• Disconnect the battery to avoid any electrical issues during repairs.

2. Address Fault Codes

• Sub-step 1: Using the OBD-II scanner, retrieve and document trouble codes.
• Sub-step 2: Research each code to determine the underlying issue (e.g., P0420 for catalytic converter efficiency).
• Sub-step 3: Clear the codes and see if they reappear after a test drive.

3. Inspect and Replace Components

• Sub-step 1: Check the gas cap; replace if it is damaged or not sealing properly.
• Sub-step 2: Replace the air filter if it is dirty or clogged.
• Sub-step 3: Inspect and replace spark plugs if they show signs of wear or fouling.
• Sub-step 4: Check ignition coils for proper function; replace any faulty coils.
• Sub-step 5: Repair or replace any damaged hoses that could lead to vacuum leaks.

4. Final Checks

• Sub-step 1: Reconnect the battery and start the engine.
• Sub-step 2: Monitor the engine's performance and check for any new codes.
• Sub-step 3: Test drive the vehicle to ensure the check engine light stays off.