Help, 2010 F150, 5.4 XLT, Stalled a week ago, day or 2 later cel on, plugged code reader in and got P2196. 02 Sensor signal stuck Rich Bank 1, Sensor 1, opened the door and heard a sucking noise like a vacuum pulling air into the gas tank. Cleared codes. Day or 2 later running rough sucking noise back, no cel but I know it's coming thought I would ask for advise before it's throws the cel light on. Please advise.

 

Possible causes
- Faulty Front Heated Oxygen Sensor Bank 1
- Front Heated Oxygen Sensor Bank 1 harness is open or shorted
- Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Vacuums leaks

Because you are describing a rough idle and a sucking noise I would suspect a leak in the air intake system. When o2's fail they usually have little noticeable effect on drivability although poor fuel economy is usually noticed. Vacuum leak most probable I think. Although usually with a vacuum leak it hits bank 1 & 2...

 

Thanks jet I appreciate your response.