ok here's the problem , i've been browsing around to look for O2 sensors and im thinking to get all 4 from atlantic british plus they were on sale ,but.. after i check to make sure if it fits my 97 disco there were 2 kinds of O2 sensors; the first one says part no ERR1834 non AEL vehicle and the second part no AMR 6244 with AEL vehicle and both fits 97 disco if im not mistaken . and i dont know what AEL's and which sensors i should get since im not sure if my 97 disco is equip with AEL so i need some suggestion guys thanks....

 

You need to check your VIN number against the VIN that AB lists. Look at the labels under the hood and it will tell you if you have AEL.

http://www.roverparts.com/TechTips/k...ons_system.cfm

AEL is advanced evaporate loss. It's part of the emissions control if I understand correctly.

 

To know which evap familiy you are check the number on the black sticker right above the grill under the hood, close to the top of the radiator. Then match the number with those on this link:
http://www.roverparts.com/TechTips/k...ons_system.cfm

You will know what is your evap family and therefore which O2 sensor you need.