[amidgeha]

O2 Sensor Signals Swapped Bank 1 Sensor 1/Bank 2 Sensor 1

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

Cause:
Bank 1 Sensor 1 / Bank 2 Sensor 1 harness is open or shorted
Bank 1 Sensor 1 / Bank 2 Sensor 1 circuit connectors (wrong connection)
Faulty Engine Control Module (ECM)

Symptoms:
Check engine light