I installed two new O2 sensors part # 16276 from Autohaus arizona and installed them in my ML before catalyst.

but it seems that those sensors are not compatible because the second day i noticed on the DAS 2 fault codes P0135 and P0155 which refers to the both sensor Heaters not working.

need ur help and feedback guys

I am having the same problem with my ML430. No one has been able to get me any answers yet.

I am parting out my 2000ml55 AMG. If you need the factory o2 sensors PM me and I can sell you mine.

I tried 2 sets of Bosch O2 sensors, both set my MIL (P0135/P0155) I changed them out for genuine MB sensors and the problem went away. The Bosch sensor heating element read 9.1 ohms, and the MB sensors read only 2.0 ohms. I think the computer misread the additional resistance as an electrical problem, and set the light. So, DO NOT USE BOSCH O2 SENSORS. Save time, spend the money, get the original sensors.