Hi guys, I need some help. Pretty straigh foward, my Service Engine Soon light was on, did the diagnostics and 02 sensor came up.

I wan't to changemy o2 sensor for my Range Rover 01 4.6 that I just bought. It has 69k miles on it.

Couple of questions:

How many 02 sensor my range rover has? I was reading some stuff and I heard something abuot RRs having more than one. do I need to change all of them?

I read how to change o2 sensors, (on other vehicles), seems pretty straigh foward, any suggestions I should know specifically for range rovers?

Any other comments before I buy the sensors and start this project? (from people that have experience changing them)?

Thanks a lot, I greatly apreciate any input you guys can give me, since I can't afford to take it to the dealer and get charged 500$+ (as they told me).