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We consider a divergence form hypoelliptic operator consisting of a system ofreal smooth vector fields $X_{1},..., X_{q}$ satisfying H\"ormander conditionin some domain $\Omega\subseteq\erren$. Interior $L^{p}$ estimates, $2\leqp<\infty$, can be obtained for weak solutions of the equation$X_j^T(a^{ij}X_iu)=X_j^T F^j,$ by assuming that the coefficients $a^{ij}$belong locally to the space $VMO_X$ with respect to the Carnot--Caratheodorymetric induced by the vector fields.

$W^{1,p}_{X}$ interior estimates for variational hypoelliptic operator with $VMO_X$ coefficients