NO₂ emission is mostly related to combustion processes, where gas temperatures exceed far beyond 500 °C. The detection of NO₂ in combustion and exhaust gases at elevated temperatures requires sensors with high NO₂ selectivity. The thermodynamic equilibrium for NO₂/NO ≥ 500 °C lies on the NO side. High temperature stability of TiO₂ makes it a promising material for elevated temperature towards CO, H₂, and NO₂. The doping of TiO₂ with Al³⁺ (Al:TiO₂) increases the sensitivity and selectivity of sensors to NO₂ and results in a relatively low cross-sensitivity towards CO. The results indicate that NO₂ exposure results in a resistance decrease of the sensors with the single Al:TiO₂ layers at 600 °C, with a resistance increase at 800 °C. This alteration in the sensor response in the temperature range of 600 °C and 800 °C may be due to the mentioned thermodynamic equilibrium changes between NO and NO₂. This work investigates the NO₂-sensing behavior of duplex layers consisting of Al:TiO₂ and BaTi_(1-x)Rh_xO₃ catalysts in the temperature range of 600 °C and 900 °C. Al:TiO₂ layers were deposited by reactive magnetron sputtering on interdigitated sensor platforms, while a catalytic layer, which was synthesized by wet chemistry in the form of BaTi_(1-x)Rh_xO₃ powders, were screen-printed as thick layers on the Al:TiO₂-layers. The use of Rh-incorporated BaTiO₃ perovskite (BaTi_(1-x)Rh_xO₃) as a catalytic filter stabilizes the sensor response of Al-doped TiO₂ layers yielding more reliable sensor signal throughout the temperature range.