yeah pretty normal.....

Make your splice nice or do it twice

reference numbers are x62101, 102 and x62201,202

depends on what you take off the car,

black yellow black green, *blue, red, white tracer across all 4

 

Make sure you seal the connections so they are water tight or the O2 signal could be effected.

 

I tried to change it following some tutorials but i found that I don't have the sensor in the same place as all videos
Is there any other place ?

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Picture below shows the location of the front O2 (pre-cat) sensors for your M52 engine. The 1st picture you posted is from an M52TUB engine, different location than what you have obviously.
Your'e going to need some heat/torch and some aerosol penetrating oil to remove yours. Alternate between oil, heat, wrench repeat.
pic09.jpg

Here's the whole description of how to change the front and rear oxygen sensors on your M52 engine.
89-EXHAUST-Oxygen_Sensor_Replacement.htm

 

Picture below shows the location of the front O2 (pre-cat) sensors for your M52 engine. The picture you posted is from an M52TUB engine, different location than what you have obviously.
pic09.jpg

Here's the whole description of how to change the front and rear oxygen sensors on your M52 engine.
89-EXHAUST-Oxygen_Sensor_Replacement.htm

Thanks alot, didn't know that it would be under the car )

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Be a bit careful buying sensors without a connection! Better buy original the first time. I bought two and after a lot of trial, and error with the wires I still got a code so I could not make them work! I then put the original back after cleaning them.
Under the car, you can remove the sensor with a normal small wrench, just notice the clips that hold the wire on the back of the engine and up.....

 

I take it that this post below is what you were referring to. You never followed up and said that you cleaned up the old ones and re-installed them, what did you clean them with. Always followup with and end a post with a conclusion.
oxygen-sensor-wire-designation.1370911

 

Sorry about that, I just cleaned them with a little terpentine and let them dry out. No codes with old ones so problem must have been somewhere else.