Technical Definition:

O2 Circuit No Activity Detected (Bank 2, Sensor 2)

Technical Description:

This code is for a post-catalyst oxygen sensor that isn’t operating porperly or not at all. The catalyst, or catalytic converter is used to control emissions. This particular o2 sensor on Bank 2, position 2 is after the converter on bank 2 and monitors the catalyst efficiency of the catalytic converter on that bank.

Possible Causes:

• Holes in exhaust near post cat o2 sensor
• Bad Bank 2, position 2, o2 sensor
• Wiring problem, melted harness, broken connectors, etc.
• Bad PCM

Possible Symptoms:

• MIL (Malfunction Indicator Lamp) on
• May idle or drive poorly
• Fuel economy may decrease

O2 Sensor Circuit No Activity Detected Bank 2 Sensor 2

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

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

Specific Makes:

– High Fuel Consumption
– Excessive Smoke from Exhaust