how to fix dashboard warning lights on my Toyota Corolla E210 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Address Diagnostic Trouble Codes (DTCs)

• Reconnect the OBD-II scanner and retrieve any codes.
• Research codes to identify specific problems (e.g., P0420 for catalytic converter efficiency).
• Document codes for reference during repairs.

3. Fluid Level Checks

• Check engine oil level using the dipstick; add oil if low (use manufacturer-recommended oil type).
• Inspect brake fluid reservoir; top up with the correct type of brake fluid if necessary.
• Verify coolant level; add coolant if below the minimum mark.

4. Visual and Electrical Inspection

• Check for battery corrosion: Clean terminals with a wire brush and reconnect securely.
• Inspect wiring and connectors related to specific warning lights for damage or disconnection.

5. Reset and Test

• Reconnect the negative battery terminal after performing the necessary checks and repairs.
• Start the vehicle and monitor the dashboard for any persistent warning lights.
• If warning lights remain, re-scan with the OBD-II scanner to check for new codes.