how to fix my Toyota Corolla E210 (2019-2024) if the check engine light is on

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a level surface and engage the parking brake.

2. Address Error Codes

• Use the OBD-II scanner to read the error codes.
• Research the codes to identify potential issues (e.g., P0171 for lean condition).
• Clear the codes and run the engine to see if the light returns.

3. Repair Identified Issues

• If a faulty sensor is indicated:
  • Locate the sensor (e.g., O2 sensor, MAF sensor).
  • Disconnect the wiring harness and remove the sensor.
  • Install the new sensor and reconnect the wiring.
• If a vacuum leak is found:
  • Inspect and replace damaged hoses or gaskets.
• If low fluid levels are detected:
  • Top off or replace fluids as necessary.

4. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle for a few minutes.
• Check for any abnormal sounds or leaks.

5. Final Checks

• Take the vehicle for a test drive, monitoring the behavior.
• Use the OBD-II scanner again to check if any codes reappear.