how to check for a bad catalytic converter on Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool and the vehicle is parked on a level surface.
• Safety equipment: gloves, safety glasses.

2. Remove the Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, and extension.
• Disconnect the negative battery terminal.
• Remove the oxygen sensors located before and after the catalytic converter.
• Be cautious of any wiring and connectors; they can be fragile.

3. Test the Catalytic Converter

• Tools Required: Infrared thermometer or temperature probe, backpressure gauge.
• Measure the inlet temperature of the catalytic converter (upstream).
• Measure the outlet temperature (downstream) after the converter.
• A temperature difference of more than 100°F indicates a potential blockage or failure.
• Conduct a backpressure test by installing the gauge at the oxygen sensor port; backpressure should not exceed 1.5 psi at idle.

4. Remove and Inspect the Catalytic Converter

• Tools Required: Socket set, torque wrench, penetrating oil.
• Loosen and remove the exhaust bolts securing the catalytic converter.
• Carefully detach the catalytic converter from the exhaust system.
• Inspect for physical damage, cracks, or signs of overheating.

5. Replace if Necessary

• Parts Required: New catalytic converter (ensure it meets OEM specifications).
• Install the new catalytic converter, ensuring proper alignment with exhaust flanges.
• Torque the bolts to the manufacturer's specifications (typically around 30-40 ft-lbs).
• Reinstall the oxygen sensors.