144.906 A (unmarked or with 1 yellow dot) and N° 2 D 5.402.234 K (2 yellow dots). IMPORTANT : With control unit N° 5.439.822 A: - a standard pressure sensor N° DX. 144.263 A must be fitted - never fit an air temperature sensor. b) The control unit Ne DX. 144.906 B (Bosch Ref. N° 02.800.000.22) replacing on identical control unit. c) The control unit N° 5.429.447 D (Bosch Ref. N° 0.280.000.047) replacing an identical control unit. NOTE : These three control units are fitted with an externally controlled potentiometer : never alter its adjustment.