A lawyer can face consequences for lying, especially if the lie results in substantial financial harm to their client. However, a lawyer’s dishonesty doesn’t automatically equate to malpractice. It depends on whether their misconduct led directly to a negative outcome in your case.
For example, imagine that opposing counsel made a settlement offer and your lawyer rejected it without telling you about it. Then later you lost your case or had to accept a much lower settlement offer. In this scenario, you can likely sue your lawyer for malpractice.