Bosch 1275101078 NOx Sensor Assembly

The Bosch 1275101078 is a 12V nitrogen oxide (NOx) sensor designed for diesel exhaust aftertreatment systems. It utilizes a ceramic sensing chip with an integrated heating circuit to provide rapid, accurate measurement of NOx concentration upstream and downstream of the selective catalytic reduction (SCR) catalyst. The sensor enables closed-loop control of urea dosing and supports on-board diagnostics (OBD) compliance. The probe features a bolt-on mounting style with a standard M18x1.5 thread pitch and a mini-blade female electrical connector. It serves as a direct replacement for OEM part numbers 68171188AB (Chrysler/Ram/Jeep), 1277022687 and 0055262382 (Fiat/Alfa Romeo), and 55262382 (Jaguar Land Rover). Cross-references include Bosch manufacturer part number 0281006587.