before o2 sensor need to be replaced,1985,850 turbo

[850lover]

hi,everybody

I am new member here,but I often visit here to get helpful information

I have a code 435 with before o2 sensor slow,so I bought new sensor with connector,when I was trying to replace it,it was very difficute(even can't reach it by hand) to unplug the old connector,any friend who replaced o2's connector before can tell me the right method to unplug the old connector

another question

I flash the my 95 850 turbo transmission fluid with mobil 3309,but somebody said I should use regular dexon iii instead of mobil 3309,is it truth,I am scared to damage my trandmission

thanks in advanced

[MadeInAmerica]

Read this http://volvospeed.com/Repair/o2sensor1.php
I wouldnt advise trying to get to the connector as he says in the article from the bottom. Its almost impossible to do . Really, on a '94 850 Turbo because of the obstructions. I did it this way but you are using one hand also and I wouldnt do it this way again because its a real SOB.

Someone said you could take off the drivers front tire to get to the connector that way. I would try that and see if you can do it that way first. Otherwise you will have to move stuff in the engine bay if you go in from the top.

There is a special way to disconnect the connector so read carefully.

[robert213]

another question

I flash the my 95 850 turbo transmission fluid with mobil 3309,but somebody said I should use regular dexon iii instead of mobil 3309,is it truth,I am scared to damage my trandmission

thanks in advanced

Run a search on "3309" on this forum. You will learn something like Mobil 3309 is required for 1999 and newer five-speed automatic transmissions -- maybe some four-speeds, not sure.

I don't believe that Mobil 3309 will harm your 1995 transmission. It is just very expensive -- something like $18 per quart. If you are willing to spend that kind of money, I would perform a flush (like described in how-to procedures on this website) will Amsoil Synth ATF.

[850lover]

Thanks a lot