![]() ![]() This is mostly common with Euro 4/5 standard vehicles. Vehicles can also be fitted with two nox sensors. (different from one manufacturer to other) the vehicle will enter limp mode. Should such fault/error be detected, vehicle ECU will start limp mode timer, and, after a certain number of hours, starts etc. If excessive NOx or ammonia concentrations exist at the SCR outlet, an OBD malfunction/fault will be triggered, as NOx sensors are sensitive to both gases. To satisfy various OBD requirements, SCR systems typically use a NOx sensor downstream of the SCR catalyst. ![]() The most recent area of NOx sensor application are SCR systems for light and heavy duty diesel engines. The development of exhaust gas NOx sensors started in the 1990s. NOx – a nitrogen oxide sensor is a high-temperature device/sensor built/designed to detect nitrogen oxides in combustion environments such as an automotive or truck exhaust emissions. ![]()
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