How to repair leak between P-trap arm and drain pipe

Question

I recently replaced my bathroom faucet including the water supply lines and I now have a slow leak from the drain pipe/P-trap connection. I'm thinking I must have accidentally bumped the P-trap or drain pipe when I was under the sink replacing the faucet. The leak is coming from between a 1 1/2" to 1 1/4" reducer and black ABS 1 1/2" pipe (see photos).

Question 1): To repair, do I simply need to replace the 1 1/2" to 1 1/4" ABS to P-trap reducer? If so, will this product work?

Question 2): As I've never cemented ABS pipe before, my understanding is that I use ABS cement to weld the two pieces of pipe together. If so, will this product work?

Thank you very much!

Answer 1

It looks like that reducer is cemented on to a 22 1/2 degree sweep and separating them will really a job. You best bet would be to remove both those pieces because you don't know exactly which piece is leaking. Cut that second piece where it comes out of the wall as close to the bent as possible to save as much of the protruding pipe so you can cement a new piece on to it. You might have to chip a little wall away to expose more pipe. then get the piping you'll need to reconnect everything, maybe clean it up a bit. that cement will work fine with the ABS piping.