my Toyota Corolla E170 (2013-2019) has a light on the dashboard how to identify the issue

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, flashlight
• Ensure the vehicle is parked on a level surface and the ignition is turned off. Disconnect the battery if necessary for safety.

2. Retrieve Diagnostic Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Turn the ignition to the "On" position (engine off) and follow the scanner instructions to retrieve DTCs.
• Record all codes displayed and research their meanings.

3. Address Identified Issues

• Based on the codes retrieved, follow manufacturer specifications to address the specific issue (e.g., replace faulty sensors, fix wiring issues).
  • Example for a P0420 Code (Catalytic Converter Efficiency):
    • Inspect exhaust system for leaks.
    • Test the oxygen sensors for proper operation.
    • Replace catalytic converter if necessary.

4. Clear Codes and Test

• After completing repairs, use the OBD-II scanner to clear the codes from the vehicle's computer.
• Reconnect the battery if it was disconnected.

5. Road Test

• Take the vehicle for a test drive to ensure the warning light does not re-illuminate and that the vehicle operates normally.