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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Address Error Codes

• Sub-steps:
  1. Connect the OBD-II scanner to the vehicle's diagnostic port.
  2. Retrieve and note the trouble codes displayed.
  3. Research the codes to determine specific issues (e.g., P0420 for catalytic converter efficiency).

3. Resolve Identified Issues

• Sub-steps:
  1. If a faulty oxygen sensor is indicated, remove the old sensor using a socket wrench, and install the new one, tightening to manufacturer specifications.
  2. For a vacuum leak, identify the source, replace any damaged hoses, and ensure all connections are secure.
  3. If the air filter is clogged, remove the air filter housing, replace with a new filter, and reassemble.
  4. If the fuel cap is faulty, replace it with a new cap that meets OEM specifications.

4. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the negative battery terminal securely.
  2. Use the OBD-II scanner to clear error codes from the vehicle's computer.
  3. Start the engine and check for the check engine light re-illuminating.