O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)

What does this mean?

Code P0136 indicates a malfunction in the downstream oxygen sensor circuit on Bank 1. This sensor monitors catalytic converter efficiency.

Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Lexus Is models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.