Are you sure about that Peter..... that oxy sensor didnt happen until 1980?

My '77 Euro spec 116 has oxygen sensor light socket on instrument panel, but never was hooked up at factory and covered with tape in back...... maybe USA / California spec cars had the sensor?

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'80 300SD/ w116
'79 240D 4-spd
'71 750cc Guzzi

previously owned:

'83 240D 4-spd
'77 280SEL 4-spd
'74 280/8
'72 250/8
'65 220Sb 4-spd
'63 220Sb 4-spd
'63 190c 4-spd
'61 220Sb 4-spd
'60 190b 4-spd