The 02 light comes on daily in my 87 260E, I would like to clean or replace the sensors. so my question is, where are they and how should I clean them?

 

You have one sensor on that car and it is located on your catalytic converter near the front.

 

replace it very easy 22mm spanner or 7/8 undo fom exhaust pipe near to cat undo wire .
buy universal bosch unit 50 euros ish and follow the instructions on leaflet on how to connect wires.
you will need to tell your factor if it is 3 wire or 4wire good luck

 

Thanks,

Actually I went back in my records and found that i had the sensor replaced, but the issue is still occurring, with sputtering and some stalling. The shop that i take has no idea what the problem is,Im at a loss.

 

Clean up your throttle body & replace the o2 sensor ...for some cars there are 2pcs... i would just replace all of it... an aging sensors tend to break down

hope it works out