why does my Honda Accord 9th Generation (2013-2017) check engine light keep coming on

Solution

1. Preparation

• Gather tools and parts needed for repairs.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Address Error Codes

• Based on the error codes retrieved, focus on the specific system indicated (e.g., P0420 for catalytic converter issues).
• For code P0420, proceed to inspect the catalytic converter and oxygen sensors.

3. Inspect and Replace Components

• Ignition System:

  • Remove the spark plugs using a socket set.
  • Inspect for wear; replace if necessary.
  • Check ignition coils for functionality, replacing any faulty components.

• Oxygen Sensors:

  • Locate the upstream and downstream oxygen sensors.
  • Disconnect the electrical connectors and remove the sensors using an O2 sensor socket.
  • Install new oxygen sensors, ensuring proper torque (generally 30 lb-ft) and reconnecting electrical connectors.

• Catalytic Converter:

  • If diagnosed as faulty, remove the exhaust system components as necessary to access the catalytic converter.
  • Disconnect the oxygen sensors and exhaust flanges.
  • Replace with a new catalytic converter, ensuring all connections are secure and leak-free.

4. Reassemble and Clear Codes

• Reattach any components removed during inspection and repair.
• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any trouble codes and reset the check engine light.