why does my Toyota Corolla E210 (2019-2024) check engine light keep coming on

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Address Fault Codes

• Sub-step 1: Refer to the OBD-II scanner results to determine the specific fault code(s).
• Sub-step 2: Research the fault code(s) to understand the underlying issue (e.g., P0420 for catalytic converter efficiency).
• Sub-step 3: Target the repair based on the identified fault code.

3. Replace Faulty Components

• Sub-step 1: If the issue is a faulty oxygen sensor, remove the old sensor using a socket wrench and install the new sensor, tightening it to the manufacturer's specification (usually around 30-40 Nm).
• Sub-step 2: If a spark plug is faulty, remove the ignition coil, then unscrew and replace the spark plug, using a torque wrench to tighten it to the specified torque (typically 12-16 Nm).
• Sub-step 3: For a damaged fuel injector, disconnect the fuel line, unscrew the old injector, and install the new one, ensuring it is seated properly.

4. Clear Codes and Reconnect Battery

• Sub-step 1: Use the OBD-II scanner to clear any error codes from the vehicle’s computer.
• Sub-step 2: Reconnect the battery and ensure all connections are secure.

5. Test Vehicle

• Sub-step 1: Start the engine and observe if the check engine light remains off.
• Sub-step 2: Perform a test drive to confirm no issues arise during operation.