The answer to 'how to fix drain trap' is to clean or replace the drain trap under your sink. The drain trap is a curved section of pipe that holds a small amount of water to prevent sewer gases from entering your home. Over time, the trap can become clogged with debris, causing slow drainage or foul odors.
To fix a drain trap, first locate the trap under your sink. It is typically a U-shaped or P-shaped pipe. Use a bucket to catch any water that may spill out. Unscrew the trap and remove it from the drain. Use a wire brush or plumber's snake to clear any debris or buildup inside the trap. If the trap is severely damaged or cannot be cleaned, you may need to replace it with a new one. Once the trap is clean or replaced, reattach it to the drain and check for proper water flow and no leaks.