The answer to 'my sewer repair smells bad' is that a foul odor coming from a sewer repair is often caused by improper installation, a damaged or leaking pipe, or a blockage in the sewer line. This can allow sewer gases to escape into your home, creating an unpleasant and potentially dangerous situation.
Some common symptoms of a smelly sewer repair include a strong rotten egg or sewage-like odor, gurgling sounds from drains, and slow draining sinks or toilets. The solution may involve re-sealing the repair, replacing damaged pipes, or clearing a blockage. However, these issues can be complex and dangerous, so it's best to call a professional plumber to diagnose and fix the problem properly.