how to know if the catalytic converter is bad on my Honda Accord 10th Generation (2018-2022)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, infrared thermometer, backpressure gauge, socket set, safety glasses, gloves.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to avoid electrical issues.

2. Remove the Catalytic Converter

• Sub-steps:
  1. Lift the vehicle safely using jack stands.
  2. Locate the catalytic converter; it's typically situated under the vehicle, between the exhaust manifold and the muffler.
  3. Using a socket set, remove the bolts securing the catalytic converter to the exhaust system. Take care not to damage the exhaust flanges.
  4. Disconnect any O2 sensors attached to the catalytic converter by carefully unscrewing them.

3. Inspect the Catalytic Converter

• Sub-steps:
  1. Visually inspect the inside of the catalytic converter for signs of physical damage or blockage.
  2. Shake the unit gently; rattling noises may indicate damaged internal components.
  3. Use a flashlight to check for discoloration or melting, which can signify overheating.

4. Replace the Catalytic Converter (if necessary)

• Sub-steps:
  1. If the converter is determined to be faulty, procure a replacement part that meets OEM specifications.
  2. Position the new catalytic converter in place and secure it using the original bolts.
  3. Reconnect any O2 sensors, ensuring they are tightened properly.

5. Reconnect the Battery and Test

• Reconnect the battery terminals securely.
• Start the engine and allow it to idle, checking for any exhaust leaks around the newly installed converter.