Circuit Description
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
This DTC is recorded when A/F sensor has a malfunction, although the caption is oxygen sensor. Refer to CIRCUIT DESCRIPTION under DTCs P2195, P2196, P2197 & P2198: OXYGEN SENSOR SIGNAL STUCK (BANK 1 &/OR 2 SENSOR 1).