why does my Toyota RAV4 engine light keep coming on

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secure with wheel chocks.

2. Address Error Codes

• Using the OBD-II scanner, retrieve and document error codes.
• Research codes to determine affected systems (e.g., P0171 for lean condition).

3. Repair Identified Issues

• For Ignition Problems:

  • Remove ignition coils and inspect spark plugs.
  • Replace faulty spark plugs with OEM equivalents (Torque to specifications).
  • Reinstall ignition coils securely.

• For Fuel System Issues:

  • Inspect and replace fuel filter if clogged (ensure proper fuel flow).
  • Replace faulty fuel injectors as needed.
  • Check and replace the fuel pump if pressure is inadequate.

• For Vacuum Leaks:

  • Inspect vacuum hoses for cracks or disconnections.
  • Replace any damaged hoses and secure clamps.

4. Reassemble and Reconnect

• Reinstall any components that were removed during repair.
• Reconnect the negative battery terminal.
• Clear any error codes using the OBD-II scanner.