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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety during repairs.
• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, basic hand tools.

2. Addressing Error Codes

• Connect the OBD-II scanner and retrieve the error codes.
• Research the codes to determine the specific issues (e.g., P0420 for catalytic converter efficiency).
• Clear the codes and take the vehicle for a test drive to see if they return.

3. Inspecting and Replacing Components

• If the gas cap is damaged, replace it with a new one.
  • Tools Required: Hand tools for removing the old cap.
• If the air filter is clogged:
  • Remove the air filter housing with a socket set.
  • Replace with a new air filter, ensuring proper fit.
• For spark plug or ignition coil issues:
  • Remove the ignition coils using a socket set, then replace faulty components with new ones.
  • Torque the bolts to the manufacturer's specifications (typically around 7-15 ft-lbs).

4. Exhaust System Inspection

• Visually inspect the exhaust system for any signs of leaks or damage.
• If leaks are found, replace the affected components (e.g., gaskets, pipes).
• Ensure all connections are tight and secure.