HELP I am open to any ideas on this one/ help? I had the service engine soon appear on my 2003 range rover 4.4. The codes were for the o2 sensors. I swapped out all four and cleared the codes out. The service engine soon light keeps coming on and there is no fault code just states that my front o2 sensors are aging, Any ideas, I have reset the fault codes several times now. The o2 sensors came From Atlantic British.