how to fix a clogged catalytic converter in Honda Accord 9th Generation (2013-2017)

Solution

1. Preparation

• Tools Required: OBD-II scanner, jack and jack stands, socket set, torque wrench, exhaust pressure gauge.
• Safety Warnings: Allow the engine to cool before beginning repairs. Wear safety glasses and gloves.

2. Remove the Catalytic Converter

1. Lift the Vehicle: Use the jack to lift the front of the vehicle and secure it with jack stands.
2. Disconnect Battery: Disconnect the negative terminal of the battery to prevent electrical shorts.
3. Unbolt Exhaust Flanges: Use the socket set to remove the bolts securing the catalytic converter to the exhaust system at both ends (manifold and mid-pipe).
4. Remove O2 Sensors: Carefully unscrew the upstream and downstream oxygen sensors from the catalytic converter using a wrench.
5. Extract Catalytic Converter: Remove the catalytic converter from its mounting brackets and take it out of the vehicle.

3. Clean or Replace Catalytic Converter

1. Inspect the Converter: If the converter is intact and not physically damaged, you may attempt to clean it.
   • Use a specialized catalytic converter cleaner, following the manufacturer's instructions.
   • Let the cleaner sit for the recommended time and flush with water if applicable.
2. Replace if Necessary: If cleaning does not resolve the issue or if the converter is damaged, replace it with a new unit.
   • Ensure that the replacement catalytic converter is compatible with the 2013-2017 Honda Accord.

4. Reinstall the Catalytic Converter

1. Position the Converter: Place the cleaned or new catalytic converter back into position.
2. Reattach O2 Sensors: Screw the upstream and downstream O2 sensors back into the catalytic converter.
3. Secure Flanges: Reinstall the bolts to secure the catalytic converter to the exhaust system, tightening them to the manufacturer's torque specifications.
4. Reconnect Battery: Reconnect the negative battery terminal.

5. Test the System

1. Start the Engine: Start the vehicle and let it idle to check for any exhaust leaks.
2. Check for Error Codes: Use the OBD-II scanner to clear any previous codes and check for new ones after a test drive.