Symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

- Bank 1 Sensor 2 / Bank 2 Sensor 2 harness circuit shorted - Bank 1 Sensor 2 / Bank 2 Sensor 2 harness circuit connectors (wrong connection) - Faulty Engine Control Module (ECM)

Description

The heated oxygen sensor (HO2S) monitor determines if the HO2S signal response for a fuel shift corresponds to the correct engine bank.