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O2 Mileage sensor?

Started by rumb, 24 January 2024, 05:13 PM

rumb

Friend's 1980 450sel, he says there is a mileage counter on the speedo cable that sets off a dash light when the O2 sensor has been used for X miles.

Found this:
https://handbook.w116.org/cd/Engine/107/M117_45/1980/14-050.pdf

weirdly the manual page 15 says just to unplug the device when the mileage reaches 30K miles?

Is there a way to reset the device?
'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS
'21 E450 Cabrio

raueda1

Sorry I can't help with the actual question, but one question begets others.....

First, very interesting reading.  I'm amazed by this whole setup, which I completely lack.  Seems like a lot to go wrong so I'm amazed that people manage to keep these older cars going at all.  Congratulations to all of you. 
Second, I thought your car was a euro but I guess not?  If not, any chance of pulling all that stuff off and calling it a euro?  I guess CA mandates emissions testing on old cars but UT didn't and neither does CT. Thank god again.  What about CO?  Cheers,
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

UTn_boy

Hopefully this will help. 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo

rumb

"Disconnect plug"    :o

How utterly unMercedes...

'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS
'21 E450 Cabrio

UTn_boy

I assume that they mean for us to plug it back in after unplugging it to reset the switch? 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo