hello .. i have one question for the O2 sensor( bank 1 sensor 2) which one is . the front lambda or the another one ....under . thanks

bank 1 is all you've got with a 4cyl engine. A Vee engine has bank 2 on the other side.

Sensor 1 is the nearest to the engine, the front one as you described.
Sensor 2 is the one after the cat, so lower down/further back.