Yantras have multiple uses, and the removal of Vastu dosha is one of them. People’s common mistake with yantras is buying them and installing them without & activating them. It’s like having an ATM card without a 4-digit pin. Yantras are used to activate Rājayoga in a horoscope; even the placement and direction of the Yantra at home or office must be based on the horoscope or birth chart
For example, Kaartik has Jupiter in Lagna, and he has placed a Vyasa Yantra above the place he sits during his teaching classes or consultations.