Technical Definition:

O2 Circuit High Voltage (Bank 2, Sensor 1)

Technical Description:

The o2 (oxygen) sensors basically measure oxygen content in the exhaust. The PCM (powertrain control module) then uses this information to regulate fuel injector pulse. The o2 sensors are very important to proper operation of the engine. Problems with them can cause the PCM to add or take away too much fuel based on the faulty o2 sensor voltage.

Possible Causes:

• Bad bank 2, 1 o2 sensor incorrectly reading rich condition
• Engine running rich and o2 sensor
• Correctly reading rich condition
• Signal shorted to voltage in harness
• Wiring harness damage/melted due to contact with exhaust components
• Vacuum leak (make have lean codes (P0171, P0174) present with it)
• Leaking injectors
• Bad fuel pressure regulator
• Bad PCM

Possible Symptoms:

• MIL (Malfunction Indicator Lamp) illumination
• Engine may run very rough
• Engine may be running lean or rich depending on if the o2 sensor is reading correctly or incorrectly
• Lack of power
• Increased fuel consumption

O2 Sensor Circuit High Voltage Bank 2 Sensor 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Front Heated Oxygen Sensor Bank 2
– Intake air leaks may be faulty
– Exhaust gas leaks
– Front Heated Oxygen Sensor Bank 2 harness is open or shorted
– Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
– Inappropriate fuel pressure
– Faulty fuel injectors

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust