how do I know if my Honda Civic 10th Generation (2016-2021) needs a new catalytic converter?

Solution

1. Preparation

• Gather tools and materials.
• Tools Required: OBD-II scanner, temperature gun, backpressure gauge, socket set, jack and jack stands.
• Safety Warnings: Ensure the vehicle is on a flat surface and securely lifted before working underneath; allow the exhaust system to cool before inspection.

2. Remove the Catalytic Converter

• Sub-steps:
  1. Disconnect the battery to prevent electrical shorts.
  2. Lift the vehicle using a jack and secure it with jack stands.
  3. Locate the catalytic converter in the exhaust system (between the exhaust manifold and the muffler).
  4. Remove any heat shields or brackets securing the catalytic converter.
  5. Unbolt the catalytic converter from the exhaust manifold and intermediate pipe using a socket set.
  6. Carefully remove the catalytic converter from the vehicle.

3. Inspect the Catalytic Converter

• Sub-steps:
  1. Visually inspect the catalytic converter for signs of damage such as dents, cracks, or rust.
  2. Shake the catalytic converter gently; if you hear rattling, the internal substrate may be damaged.
  3. Check for any signs of contamination, such as oil or coolant leaks.

4. Install New Catalytic Converter

• Sub-steps:
  1. Position the new catalytic converter in place, ensuring proper alignment with the exhaust system.
  2. Bolt the catalytic converter back to the exhaust manifold and intermediate pipe; torque the bolts to the manufacturer’s specifications (typically around 25-35 ft-lbs).
  3. Reinstall any heat shields or brackets that were removed.
  4. Reconnect the battery.