how to check if my Toyota Corolla E210 (2019-2024) has a bad catalytic converter

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Wear safety gloves and goggles.

2. Gather Tools and Parts

• Tools Required:
  • OBD-II scanner
  • Visual inspection tools (flashlight)
  • Exhaust back pressure gauge
  • Infrared thermometer
  • Jack and jack stands
  • Wrench set
• Parts Required:
  • Replacement catalytic converter (if needed)

3. Visual Inspection

• Use a flashlight to inspect the converter for physical damage, rust, or excessive wear.
• Look for any exhaust leaks in the exhaust system leading to the catalytic converter.

4. Measure Exhaust Back Pressure

• Locate the exhaust system’s test port or create a small hole downstream of the converter.
• Connect the back pressure gauge and start the engine.
• Measure the back pressure; it should not exceed manufacturer specifications (usually below 1.5 psi at idle).

5. Temperature Check

• Use the infrared thermometer to measure the temperature at the inlet and outlet of the catalytic converter.
• A healthy catalytic converter will show a temperature difference of around 100-200°F between inlet and outlet.

6. Exhaust Flow Test

• Start the engine and allow it to idle.
• Rev the engine to about 3000 RPM and observe the exhaust flow; it should be steady and strong. A weak flow may indicate a blockage.