zolthar

I am looking to replace my O2 Sensor #2 which is the post-catalytic sensors.

I have been advised by the dealer the part number is A0015402817 which costs AUD$800 each with 3 week wait time.

I was looking at alternatives and found on Amazon a 4-set compatible A-Premium:
https://www.amazon.com.au/Premium-Co...s%2C204&sr=8-3

From what I have read, the Upstream and Downstream should be different (Dealer mentioned there is a different part for pre-cat but I didnt ask that model), is there any difference and would the above be ok as I can then replace all 4 sensors?

zolthar

Finally pulled the existing Right side (driver side in AU) O2 Post-Cat sensor and the part number is 001 540 28 17 - also breaking the tabs keeping it place!

However I found that the connectors/contacts were very wet - is this normal, if not, should I use RTV silicone to patch up after replacing or does anyone have a better solution?

zolthar

If anyone in AU is changing it themselves - this part worked great:
Fuelmiser #COS598

Used die-electric grease and reset the codes.

Maj. Dundee

zolthar. any vehicle after 2005 is a 164 vehicle. I suggest you visit this forum.

https://www.benzworld.org/forums/w164-m-class.53/

zolthar

Thank You Maj. however I should have clarified the O2 Sensors were for my 99 ML320 W163.

Or did I completely misunderstood your reply (which happens to me often) ?