how to check if the catalytic converter is bad on Honda Civic 9th Generation (2012-2015)

Solution

1. Preparation

• Gather all necessary tools and safety equipment.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid any electrical issues.

2. Remove Catalytic Converter

• Tools Required: Socket set, ratchet, penetrating oil, torque wrench.
• Apply penetrating oil to the exhaust bolts and let it sit for a few minutes.
• Remove the bolts securing the catalytic converter to the exhaust pipe and the exhaust manifold.
• Carefully detach the catalytic converter from the exhaust system.

3. Inspect and Test Catalytic Converter

• Visually inspect the catalytic converter for any signs of damage, such as cracks or excessive carbon buildup.
• Use an infrared thermometer to measure the inlet and outlet temperatures of the catalytic converter.
  • The inlet temperature should be notably lower than the outlet temperature (typically more than 100°F difference indicates a failing converter).
• If performing a backpressure test, insert the pressure gauge into the upstream O2 sensor port and run the engine at around 2000 RPM.
  • A reading over 2.5 psi indicates a blockage.

4. Replacement (if necessary)

• If the catalytic converter is determined to be faulty, replace it with a new unit.
• Follow the reverse procedure to install the new catalytic converter, ensuring all bolts are tightened to the manufacturer’s torque specifications.