Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

If a malfunction cannot be found when troubleshooting DTC P0420-00, a lean or rich abnormality may be the cause. Perform troubleshooting by following the inspection procedure for P0171-00 (System Too Lean) and P0172-00 (System Too Rich).
Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.