how to fix P0420 code on Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle securely on jack stands.

2. Inspect and Replace Oxygen Sensors

1. Locate the oxygen sensors (pre-catalytic and post-catalytic).
2. Disconnect the wiring harness from both oxygen sensors.
3. Remove the oxygen sensors using an oxygen sensor socket or a wrench.
4. Install new oxygen sensors by threading them in and tightening to the manufacturer's specification (typically around 30 lb-ft).
5. Reconnect the wiring harness to both sensors.

3. Inspect and Replace Catalytic Converter

1. Remove exhaust components leading to the catalytic converter (if necessary), using a socket set.
2. Disconnect the catalytic converter from the exhaust pipe and exhaust manifold flanges.
3. Inspect the old catalytic converter for any signs of clogging or damage.
4. Install the new catalytic converter, ensuring a proper fit and alignment.
5. Tighten the bolts to the manufacturer's torque specifications (check service manual; usually between 30-50 lb-ft).
6. Reattach any exhaust components removed earlier.

4. Clear Codes and Test

1. Reconnect the battery.
2. Use an OBD-II scanner to clear the P0420 code.
3. Test drive the vehicle for a sufficient distance to allow the system to monitor the catalytic converter's performance.