why does my Toyota Corolla E140 (2006-2013) check engine light keep coming on

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Address Diagnostic Codes

• Sub-step 1: If the OBD-II scanner indicates specific codes (e.g., P0420 for catalytic converter efficiency), research the code for a targeted solution.
• Sub-step 2: Clear the codes and perform a test drive to see if they return.

3. Inspect and Replace Spark Plugs

• Sub-step 1: Remove the engine cover if applicable.
• Sub-step 2: Use a socket set to remove the spark plug wires or coils.
• Sub-step 3: Use a spark plug socket to remove the old spark plugs.
• Sub-step 4: Install new spark plugs to the manufacturer's specified torque (typically 13-15 ft-lbs).
• Sub-step 5: Reattach the wires or coils.

4. Clean or Replace MAF Sensor

• Sub-step 1: Disconnect the electrical connector from the MAF sensor.
• Sub-step 2: Use a MAF cleaner to spray the sensor elements (do not touch them).
• Sub-step 3: Allow it to dry completely before reconnecting.
• Sub-step 4: If cleaning does not resolve the issue, replace the MAF sensor with a new unit.

5. Inspect Exhaust System

• Sub-step 1: Visually inspect for any cracks or holes in the exhaust pipes and catalytic converter.
• Sub-step 2: Use a smoke test or pressure test to identify leaks if necessary.
• Sub-step 3: Replace any damaged components as needed.