how to fix my Toyota Corolla E170 (2013-2019) with a check engine light on

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety during repairs.

2. Address Error Codes

• Use the OBD-II scanner to read the error codes.
• Research the codes to identify the specific issue (e.g., P0420 for catalytic converter efficiency).
• Clear the codes and monitor if they return after starting the vehicle.

3. Inspect and Replace Components

• Air Filter Replacement:

  • Remove the air filter housing cover using a socket set.
  • Take out the old air filter and replace it with a new one.
  • Reassemble the air filter housing.

• Gas Cap Inspection:

  • Remove the gas cap and inspect the rubber seal for wear or damage.
  • Replace the gas cap if necessary and ensure it is tightened properly.

• Vacuum Hose Inspection:

  • Trace all vacuum hoses in the engine bay.
  • Replace any damaged or cracked hoses with new ones.

4. Check and Replace Spark Plugs (if necessary)

• Remove the ignition coil using a socket set and inspect the spark plug.
• Replace worn spark plugs with new ones, ensuring they are gapped correctly (refer to manufacturer specifications).
• Reinstall the ignition coils.

5. Final Checks

• Reconnect the negative terminal of the battery.
• Start the engine and observe the operation for unusual noises or performance issues.