Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - High Fuel Consumption - Excessive Smoke from Exhaust

Possible Causes

- Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted - Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection - Faulty Heated Oxygen Sensor Bank 1 Sensor 3

Description

The powertrain control module uses the oxygen sensor to calculate the air/fuel ratio in the exhaust.