O2 Sensor Issues

[bienville_fly]

Hey Guys, I've been snooping around some and have gotten some very good info here. I hope to eventually have an opinion worth giving but for right now I have a question.

I have a 2004 Land Rover Discovery 2 (SE7) and I keep having trouble with my o2 Sensors. It is always on the 2nd bank. I just replaced the upper intake manifold gasket, and both valve cover gaskets, throttle body gasket and replaced all four of the o2 sensors.

But I keep getting a code for the upstream o2 sensor. It isn't putting my service engine light on but it is showing on my carsoft.

Also I am using the o2 sensors suggested from Atlantic British. The truck is running perfectly and I'm not getting any spotting in my exhaust or rough idling like it did before I replace the o2 sensors.

I will clear the code but within about 20 miles or so it pops back up. Any help would be appreciated.

Thanks guys

 

[joey]

Try cleaning your Mass Air Flow Sensor.

 

[Scott Bebber]

Were you able to find the issue?. If not, are you able to monitor fuel trim data at idle and at 2500 rpm?