Kitchen leak behind wall

[Nadia25]

So here is my problem about a week ago my sink ( i do have a garbage disposal )started to get clogged and I noticed the water started coming out from under the dishwasher.. I had my brother in law come check it out and he discovered there's some type of leak in a pipe that goes from behind a concrete wall. Now I need to get the sink unclogged first and find a way to knock a part of my wall down so the pipe can get fixed. I do not have the money to hire a plumber and my bil is out of town any ideas on how to unclog my sink or any suggestions on what I should do or call to get everything fixed.

 

[Terry]

A picture 800 pixels or less would help us here.
There are so many things it could be.

 

[Sponsor]

 

[Nadia25]

The water is suppose to be off from under the sink but its still leaking as you can see the pipe goes behind the wall to outside

 

[Terry]

The black pipe is the drain. ABS 1-1/2" pipe into a male fitting, threaded into a galvanized tee.
Where is it leaking on that pipe?

If the faucet is leaking from underneath, it could be that it needs a new stem, cartridge or washer. I can't tell the brand on that.
Normally you have shutoffs under the sink to isolate the faucet.

 

[Nadia25]

The faucet is not leaking from underneath the sink.. And we cant see exactly where its leaking from because the wall is in the way. I was told to have the sink unclog first but a plunger doesn't seem to work and if I run the water it all drains under the dishwasher to my kitchen floor and through a small hole outside.

 

[MKS]

Maybe a picture of the plumbing under the sink. There is a inspection cover at the front bottom of the dishwasher usually a couple of screws. May be able to see something there with a flashlight.