Circuit Description

WARNING: This page is about a different variant/trim than selected.

The bank 1 sensor 2 or bank 2 sensor 2 heated oxygen sensor (HO2S) output signal is used by the engine control module (ECM) when calculating the oxygen storage capacity (OSC) of the three-way catalytic converter (TWC). The ECM can also use each HO2S voltage signal to calculate the air-fuel ratio that results in the most efficient operation of the TWC. This accomplished by minor fuel trim corrections, rich or lean, based on the output signal received from the HO2S. The ECM will adjust the air-fuel ratio in an attempt to keep the bank 1 sensor 2 and bank 2 sensor 2 output signals near 600 mV. If the ECM continues to make a rich fuel trim correction for longer than a calibrated time, in an effort to drive the post sensor near 600 mV in response to a lean engine operating condition, DTC P2096 will set for bank 1 or DTC P2098 will set for bank 2.