P2A09 – O2 Sensor Negative Voltage Bank 2 Sensor 1

P2A09 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P2A09 Possible Causes

Faulty O2 Sensor Bank 2 Sensor 1,O2 Sensor Bank 2 Sensor 1 harness is open or shorted,O2 Sensor Bank 2 Sensor 1 circuit poor electrical connection

P2A09 Description

The Engine Control Module (ECM) monitors the O2 Sensor Negative Voltage signal. The ECM sets the OBDII code when the O2 Sensor Negative Voltage is out of factory specifications.