What are the signs of a clogged catalytic converter in the 2020 Highlander?

Signs of a Clogged Catalytic Converter in a 2020 Toyota Highlander

A clogged catalytic converter can lead to various performance issues in your 2020 Toyota Highlander (Fourth Generation). Here are the common symptoms to look for:

Repair Instructions

If you confirm that the catalytic converter is clogged, follow these steps for replacement:

Tools and Materials Required

• New catalytic converter (OEM recommended)
• Jack and jack stands
• Socket set (metric)
• Wrench set (metric)
• Torque wrench
• Exhaust sealing compound (if required)
• Safety goggles and gloves
• Penetrating oil (such as WD-40)

Replacement Steps

1. Safety First

   • Park the vehicle on a level surface, engage the parking brake, and wear safety goggles and gloves.

2. Lift the Vehicle

   • Use a jack to lift the front of the Highlander and secure it with jack stands.

3. Remove Exhaust Components

   • Loosen Bolts: Apply penetrating oil to the bolts connecting the catalytic converter to the exhaust system. Use a socket wrench to loosen and remove these bolts.
   • Disconnect O2 Sensors: Unplug the upstream and downstream O2 sensors (if applicable) from the catalytic converter.

4. Remove the Catalytic Converter

   • Carefully pull the catalytic converter away from the exhaust system. Be cautious of any remaining gaskets or seals; you may need to replace them.

5. Install New Catalytic Converter

   • Position the new catalytic converter in place. Install any necessary gaskets or seals.
   • Torque Bolts: Reattach the bolts and tighten them to the manufacturer’s specifications using a torque wrench.

6. Reconnect O2 Sensors

   • Plug in the upstream and downstream O2 sensors.

7. Lower the Vehicle

   • Carefully remove the jack stands and lower the vehicle.

8. Clear Check Engine Codes

   • Use the OBD-II scanner to clear any stored trouble codes.

9. Test Drive

   • Take the Highlander for a test drive to ensure that the issue has been resolved. Monitor for any warning lights or unusual behavior.

Conclusion

A clogged catalytic converter can significantly affect your vehicle's performance. If you suspect a clog based on the symptoms listed, follow the diagnostic steps to confirm the issue, and if necessary, proceed with the replacement following the outlined repair instructions. Always refer to the vehicle's service manual for specific details related to your Highlander.