My kitchen sink has a slow leak every few weeks. Do I need a new trap?

First, you need to determine where the leak is coming from. Have you tried tightening the connections? It could be the gasket leaking where it attaches to the strainer or a crack in the pvc pipe.

The source of the leak needs to be found, one way to do this is to take a clean dry kleenex and fold it, do not crumple it. Then take the kleenex and one touch at a time touch it to different areas where you suspect a leak. Look at it each time you touch an area to see if it is wet. When you have found it,you'll know where to fix.

Best to you.

You need to find the leak first. If its from the P trap nuts you just need new gaskets. Kitchen sink drain is 1 1/2", bath room sink drain is 1 1/4". If it's from the stub out that would need a new gasket. Hand tighten the nuts then just a 1/4 turn with a wrench. You don't want to crush the gaskets or they will leak

here is more info

https://www.johncflood.com/blog/plumbing/how-to-fix-a-leaking-p-trap

You should find the joint where the leak is coming from. You may need plumbers tape to better seal it so you don't need a bucket.

There are a few common reasons why you have a leak under the kitchen sink.

Drain Leak

Drains are typically sealed with some kind of putty or sealant to keep it from leaking, but this putty could have been put on too thin or it could dry out and crack over time. If this is the case, you may just need to replace the sealant to repair the leak. You also might be able to get away with tightening the nuts where the pipes meet to stop the leak, especially if there’s a leaking pipe under the kitchen sink.

If you have a more serious issue, however, then both of these options would be temporary fixes, which are effective in the short-term and not in the long run. Some old drains become too worn and are beyond hope for repair, requiring a full replacement. In instances like this, it’s best to contact a professional plumber to handle your drain repair.

Clogged P-Trap

The P-Trap is the curved section of pipe found under the sink, and it can be the leaking pipe under the kitchen sink that you’ve been searching for. It’s designed to keep foul smells from coming up through the drain but over the course of time, debris like food pieces and other elements dropped down the drain can clog up. This prevents proper drainage and can cause a leak in some instances. Your P-Trap could also be leaking due to corrosion, incorrect installation, fit issues, and more, so fixing a leaky P-Trap depends on the exact problem at hand. Consider consulting your plumber before attempting to fix it.

Corroded Valve Seat or Worn Out Washers

Water and time have a tendency to wear down many different materials, including metal valves and rubber washers. If this happens to the valves and washers holding your sink and piping together, a leak can occur.

A decaying washer is one of the most common causes of sink leaks, since every time the faucet is used, the washer is pressed against the valve seat. Friction from continual use can cause the washers to wear out. The valve seat connects the spout and the faucet for the compression mechanism, but water accumulation can cause it to corrode.

While washers are easy to replace, the valve can be more complicated. Getting the valve seat cleaned by a professional plumber regularly is a great way to prevent corrosion and a leak.

Faucet Leak

The kitchen faucet leaking under the sink is a fairly common issue. A leak coming from the faucet is easy to spot since water often pools up around it when the sink is turned on. Alternatively, it could leak water under the sink, meaning you’ll only notice the leak if you look under the counter while the faucet is on. This type of leak is usually caused by a worn-down gasket or faulty washer. A severe leak will require a full faucet replacement but in most cases, a small repair will resolve the leak.

You pipes may be loose at the threads. It appears correct. Tighten joints, you may need to apply Teflon tape.

IT may need a new pipe ring around the mouth of the plastic pipe

Open up the elbow and look inside sounds like there is something inside stuck in there then poor it back to get her

If you can't get a plumber you may need to put new plumbers tape around the places the pipes are attached.

You may need a new trap, but before that, find out where the leak is. This site has some information to help you find your leak.

https://marcoplumbing.ca/blog/7-common-causes-of-kitchen-sink-leaking/#:~:text=To%20identify%20where%20the%20leak,the%20source%20of%20the%20problem.

First thing to do is find where the leak is.