how to fix P0420 code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.
• Disconnect the battery negative terminal to avoid electrical issues.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:

   • Locate the upstream oxygen sensor (before the catalytic converter).
   • Use an oxygen sensor socket to remove it.
   • Inspect the sensor for damage or contamination.
   • If damaged, replace it with a new sensor.

2. Remove the downstream oxygen sensor:

   • Locate the downstream oxygen sensor (after the catalytic converter).
   • Use an oxygen sensor socket to remove it.
   • Inspect and replace if faulty.

3. Check and Replace Catalytic Converter (if necessary)

1. Inspect the catalytic converter:

   • Check for any physical damage or signs of clogging.
   • Look for rattling noises which may indicate internal failure.

2. Remove the old catalytic converter:

   • Use a socket set to remove the bolts attaching the catalytic converter to the exhaust system.
   • Carefully lower and remove the old catalytic converter.

3. Install the new catalytic converter:

   • Position the new catalytic converter and secure it with bolts.
   • Ensure all connections are tight and leak-free.

4. Reassembly and Testing

1. Reconnect the oxygen sensors:

   • Reconnect the upstream and downstream oxygen sensors to their respective plugs.

2. Reconnect the battery:

   • Reattach the negative battery terminal securely.

3. Clear the error codes:

   • Use the OBD-II scanner to erase the P0420 code from the vehicle's system.