what should I check if my Honda Accord 9th Generation (2013-2017) catalytic converter is bad

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Tools Required: OBD-II scanner, infrared thermometer, pressure gauge, socket set, torque wrench, safety glasses, gloves.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Remove the Old Catalytic Converter

• Disconnect the negative battery terminal to prevent electrical shorts.
• Raise the vehicle using a jack and secure it with jack stands.
• Remove any heat shields covering the catalytic converter, if applicable, using a socket set.
• Unbolt the catalytic converter from the exhaust system using the appropriate socket size. Ensure to support the exhaust system to prevent it from hanging freely.
• Carefully remove the catalytic converter from its mounting position.

3. Inspect and Clean

• Inspect the exhaust pipes and flanges for any signs of damage or rust; clean any debris or carbon buildup from the mating surfaces.
• If any gaskets are damaged, replace them before installing the new catalytic converter.

4. Install New Catalytic Converter

• Position the new catalytic converter into place, ensuring that it aligns correctly with the exhaust system.
• Bolt the catalytic converter to the exhaust system, tightening the bolts to the manufacturer's specifications (typically 30-50 lb-ft, but check service manual for exact torque value).
• Reinstall any heat shields if they were removed, ensuring they are secured properly.

5. Final Assembly and Testing

• Reconnect the negative battery terminal.
• Start the engine and let it idle for a few minutes; check for exhaust leaks around the new catalytic converter.
• Scan for error codes again to ensure no new codes have appeared.