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

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

• Refer to the OBD-II scanner results and prioritize the repairs needed based on the fault codes.
• For example, if a P0420 (Catalytic Converter Efficiency Below Threshold) code appears:
  1. Inspect the catalytic converter for physical damage.
  2. Check the oxygen sensors for proper operation and replace if faulty.

3. Inspect and Replace Spark Plugs

• Remove the ignition coils (if applicable) to access the spark plugs.
• Use a spark plug socket to remove the old spark plugs.
• Inspect the old plugs for wear; if needed, replace with OEM-spec plugs.
• Torque new spark plugs to manufacturer specifications, usually around 13 lb-ft.

4. Replace Oxygen Sensors (if faulty)

• Locate the oxygen sensors using the vehicle’s repair manual.
• Disconnect the electrical connector and use a wrench to remove the sensor.
• Install the new oxygen sensor and secure it, ensuring proper torque (typically around 30 lb-ft).
• Reconnect the electrical connector.

5. Recheck and Clear Codes

• Reconnect the battery.
• Use the OBD-II scanner to clear any fault codes.
• Start the engine and verify that the check engine light has turned off.