how to check for a bad catalytic converter in Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Remove the Catalytic Converter

• Sub-steps:
  1. Raise the vehicle using jack stands for access to the undercarriage.
  2. Locate the catalytic converter, typically found between the exhaust manifold and the muffler.
  3. Remove any heat shields or brackets securing the catalytic converter (use a socket set).
  4. Disconnect the exhaust pipes at both ends of the catalytic converter. Use penetrating oil if necessary to loosen bolts.
  5. Carefully remove the catalytic converter from its mounting location.

3. Test the Catalytic Converter

• Sub-steps:
  1. Inspect the internal structure for signs of melting, clogs, or contamination.
  2. If needed, perform a flow test by introducing a known volume of air through the converter to check for restrictions.
  3. Use the pressure gauge to measure back pressure; values above 2.5 psi at idle may indicate a blockage.

4. Replace or Reinstall

• Sub-steps:
  1. If the catalytic converter is confirmed faulty, install a new catalytic converter, ensuring correct orientation.
  2. Reconnect the exhaust pipes and secure all bolts to manufacturer specifications (typically 30-40 lb-ft).
  3. Reinstall any heat shields or brackets removed during disassembly.

5. Reconnect Battery

• Reconnect the negative battery terminal.