O2 sensor replacement w211 e280 cdi

[BIG_G_1979]

Hi guys as the title suggests, any tips pit falls etc of changing bank 1 sensor 1 (pre cat) o2 sensor, do these things snap etc? Thanks in advance

 

[Stegel]

I replaced one on my wife's E320 CDI - it needs a special slotted socket to accommodate the cable, but came out without a fuss or undue force. The new one (Bosch) came with the threads coated with grease, so I daresay the original was as well which prevented it seizing.