ohlord

you sure are pounding away at it
If you can assure us that an o2 sensor can "become "frozen" in their receptacles long before 100K miles." Why on earth would you make the statement to run the o2 rear until it fails or throws a cel code?
That is neither good maintenance policy nor MB factory WIS policy.

Humility and Hubris are vastly different impressions of one's abilities.

But you keep away Okay

Glyn M Ruck

In this part of the world the WIS states O2 sensor replacement every 100K kilometers. Benz is not consistent around the world.

On the 722.9 transmission for US sold vehicles they first stated "filled for life." Then they changed that to change once at 39K miles & after that filled for life - the present status. In ROW they state - and have always stated for both 722.6 & 722.9 - change every 39K miles or 60K kilometers. Where is the good practice?

Removing a seized O2 sensor at 70K miles by heating & giving a crows foot spanner a clout with a hammer works equally well at 130K miles.

ohlord

practice is you replace the o2 sensors as a normal maintenance interval item
indicated by whatever region you are located practice is.
Not suggest to members to wait and never do them unless they fail and throw a code.
Your ambiguity is quite puzzling.
Keep beating though

Glyn M Ruck

Agree with the upstream - It affects tune & fuel economy. Don't agree on downstream if cash strapped. I spends most of it's life as a passenger.

In the case of my own vehicle. All 4 will be replaced at 100,000 Km.

Gershe

I didn't understand in the feed if this in correct error of margin & will not harm my car. I've just had these placed on rear instead of 40s..