P2A09 - O2 Sensor Negative Voltage Bank 2 Sensor 1
- 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
- Engine Light ON (or Service Engine Soon Warning Light)
P2a09 DescriptionThe 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.
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