Been gone awhile...work is crazy.

I'm getting ready to move from Hawaii to Georgia. I'm shipping my '06 XJR to Los Angeles, so I can drive it across country to see family on the way.

I'm having 1 intermittent problem though. I'm getting 2 generic codes on OBDII reader....PO171 (too lean bank 1)and PO174 (same bank 2). Live data shows 2 of the 4 O2 sensors are recieving power but not sending a signal back.

Question is, can I just pull the sensors and clean them up, as some have suggested, replace them, or am I missing something entirely? My Jag runs awesome, averaging about 21mpg, and the plugs look great.

If it is the sensors, and I need to replace them, can anyone provide a link to an aftermarket supplier? Or just order them from the *******? Are they plug-in, or do they need to be "hard-wired"?

Thanks for any and all help in advance.
Chase

 

Low chance of these all being faulty at the same time...I would look elesewhere.
On my X Type the problem was a simple crankcase breather pipe which had a 3" split underneath which brought up the same codes if I remember...worth checking.
Also on the V8s there is a full load breather hose to check