why does my Toyota RAV4 XA50 (2019-2024) check engine light keep coming on

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Park the vehicle on a level surface and engage the parking brake.

2. Retrieve and Address Error Codes

• Use an OBD-II scanner to retrieve error codes.
• Research codes to determine the specific issues (e.g., P0420 for catalytic converter efficiency).
• Clear the codes and take the vehicle for a test drive to see if they return.

3. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench.
• Remove engine cover if applicable.
• Disconnect ignition coils and remove them using a socket.
• Inspect spark plugs; replace if worn or fouled.
• Reinstall new ignition coils and torque to manufacturer specifications.

4. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Check fuel pressure against specifications to ensure the fuel pump is functioning properly.
• Inspect fuel lines for leaks or cracks; replace if necessary.
• Replace the fuel filter if it's clogged or not recently changed.

5. Emission System Check

• Inspect the exhaust system for leaks, particularly around the catalytic converter and O2 sensors.
• Replace any faulty O2 sensors as indicated by codes.
• If a catalytic converter issue is indicated, consider replacement.