The answer to 'how to fix sewer line' is to first identify and locate the problem in your sewer line. This may involve using a sewer camera inspection to pinpoint the issue. Common sewer line problems include clogs, tree root intrusion, pipe breaks or cracks, and sewer line collapses. Once the problem is identified, you can determine the best course of action, which may involve DIY repairs or calling in a professional plumber.
If the issue is a simple clog, you can try using a plunger or a drain snake to clear the blockage. For more complex problems like pipe damage or tree root intrusion, you may need to excavate and replace the affected section of the sewer line. This is best left to a professional plumber who has the proper equipment and expertise to handle the job safely and effectively.