Technical Definition:

O2 Heater Circuit (Bank 2, Sensor 3)

Technical Description:

Possible Causes:

• Bad o2 sensor heater circuit
• Bad o2 sensor
• Wiring harness problems

Possible Symptoms:

• MIL (Malfunction Indicator Lamp) illumination
• Poor/ rough idle

O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 3

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Heated Oxygen Sensor Bank 2 Sensor 3
– Heated Oxygen Sensor Bank 2 Sensor 3 harness is open or shorted
– Heated Oxygen Sensor Bank 2 Sensor 3 circuit poor electrical connection

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust