Да как будто наоборот, 4,9 понадежнее. Therefore the reference air was vital to the accuracy of the sensor, because it was THE reference. It worked well in the lab, but not so good in the real life. Because the enviroment around the sensor on a car was much worse. The reference air cell was susceptible to be contaminated by the exhaust gas, and / or other surrounding pollutions. Once the reference air was contaminated, the whole characteristics of the sensor were shifted to the low side. It was called "Characteristic Shifted Down", or CSD, in the industries. This was the biggest problem of LSU 4.2 that was used by some early OEM applications. And it caused the big warranty issue to Bosch. To fix this problem, Bosch redesigned the LSU sensor, and came up with LSU 4.9 version. LSU 4.9 sensor completely got rid of the reference air. Instead, it used a reference pumping current which was equivalent to the stoic reference air, but without having any physical air in the cell.
Конечно можно и переплатить, 0 258 007 057 стоит минимум 5500, а 03C906262AJ всего 1200, есть ли смысл переплачивать?