<p>We study the quantum metrological properties of two coupled double quantum dots, where coherent tunneling and Coulomb interaction jointly govern the system dynamics. Using the quantum Fisher information framework, we evaluate the ultimate precision limits for estimating the interaction strength and temperature. We compare simultaneous and independent estimation strategies and show that parameter correlations strongly influence the achievable precision. In the simultaneous scheme, correlations may induce near-singular behavior of the quantum Fisher information matrix, leading to pronounced precision degradation in specific parameter regions. By contrast, independent estimation yields a more stable and robust precision profile. A quantitative comparison between the two strategies identifies the regimes where each approach is advantageous. Our results demonstrate that the metrological performance of coupled quantum dots is determined not only by intrinsic quantum sensitivity but also by interaction-induced correlations, providing guidance for optimizing quantum sensing protocols in solid-state nanoscale systems.</p>