A "faulty part" refers to a component or piece that is defective or not working correctly, which can lead to problems or malfunctions in a larger system or machine. Full definition
Their duties include diagnosing defects, handling preventative maintenance tasks, replacing faulty parts, updating repair records, and using a variety of special tools for diagnosing and repairing machinery. (jobhero.com)
Some of these accidents are the result of owner negligence, while others are caused by faulty parts or service. (peter-thompson-associates.com)
I had to return it and have it rebuilt due to faulty part so I was without it for a month. (velocitymicro.com)