s 80 2000 model turbo , O2 sensor issues

monkey9perth · Post by **monkey9perth** » 12 Sep 2011, 06:42

Hi all , i m new here , have 2000 S 80 with 4 of 5 oxygen sensors supposedly needing replacment , can i do this myself ,
i am handy at mechanics,
is it best to just change all 5 and hope for the best ,
i see some posts about vacuum leakage giving mis-readings from sensors . please advise ,
is there a video you know of online to show me , i ve looked but not found yet
thanks

Post by **DGM** » 12 Sep 2011, 14:45

I am not sure you meant "Oxygen sensors" but in any event find this DIY on the subject. Your connectors may be slightly different depending of the ignition system.

http://volvospeed.com/volvo_repairs_how ... or_o2.html

Normally there is two O2 sensors, one located in front of the catalytic converter and one right behind. Have your codes read and it will tell you which one is defective. Find also this video to ease installation.

It is a good idea to use one bottle of injector cleaner per tank for two tanks in a row. If your vehicule is used frequently for short trips it may bring them back in their operating range. If not they need to be changed.

Post by **boosted5cyl** » 13 Sep 2011, 10:03

There are only 4 O2 sensors in your car, not 5. There is a pair for cyls 1-3 and a pair for 4-6. This catches a lot of people out because they assume that you need a V-configuration to have separate banks. This is not true. The inline 6 in the S80 has two OBD banks\fuel systems. Only the pre-cat O2 sensors affect peformance. The post cat sensors are only there for say if the cat is working or not. The motor does not use the post cat O2s for fuelling

Replacing everything and hoping for the best is a recipe for disaster, unless you like hemorrhaging money and time. You are looking $500 in sensors, likely more. I'd rather put $500 on red at vegas to be honest

Please give more details on what is happening with the car and what error codes it is giving you.

monkey9perth · Post by **monkey9perth** » 16 Sep 2011, 02:45

thanks very much for the replies , its so good to get honest replies and help here, than from some mechanics that only want to charge you thousands of unnecessary dollars