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post #1 of 3 (permalink) Old 03-08-2009 Thread Starter
Join Date: Feb 2009
Posts: 11
V70 1999 O2 sensor connector access

Today I installed a Bosch front oxygen sensor in my V70 2.3 turbo. Installation of the sensor into the exhaust went fine, However I could not figure out after many tries how to connect the wiring harness. There is small piece of plastic that evidently snaps into place when the connectors are in place. Access to the area where the connection is made is very limited and blocked by the turbo intake from above. It appears that I could get access from under the hood by removing the air filter assembly, but even that appears to be a chore. Underneath the car access is also limited or my hands are too big. Any advice.....Well I tried to remove the air cleaner housing to gain access to the O2 sensor connectors. Seems to me if I could do this including the exit air tube, I could get access. The air tube has an adjustible metal band where it connects to the air cleaner cover, but it seems frozen to the cover. Then to remove the lower part of the housing there are two plastic spring like pegs that hold it to the body. This is the first time I have been stumped by a Volvo Repair. Rfilori was right I should have taken it to Volvo service, smile and pay the $500 plus to replace the O2 sensor.....but like most of you I'm convinced I could complete the repair with some help from the Volvo Forum Thanks
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post #2 of 3 (permalink) Old 03-09-2009 Thread Starter
Join Date: Feb 2009
Posts: 11
Smile O2 sensor installed

Well, I made another attempt to attach the O2 sensor connector and was successful For those who are interested in completing this repair on a turbo, here are a few tips. The connectors for the O2 sensors are neatly underneath the turbo pipe and access is difficult from under the car or hood. After installing the new front sensor in the exhaust pipe my challenge was to complete the wiring connection. I removed the entire air cleaner box and had better access but still I needed more. I then removed the driver side tire and loosed the brake line bracket so I had increased access from under the wheel well, where I was able to position and press the sensor side connector mount into the metal bracket. Only then I was able to connect the engine side connector with the O2 sensor connector. To complete the connection, a white plastic snap fitted over the mated connectors was completed. I have changed shocks, brakes, timing and accessory belts however the O2 sensor connectors were the most challenging repair I have made in a long time, mostly because of access. Thanks Rfilori and Sully for your input.....your comments inspired me to persist and complete this repair.
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post #3 of 3 (permalink) Old 03-09-2009
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Join Date: Nov 2008
Posts: 688
Congratulations! Sorry we didn't respond sooner, but sounds like you did a fantastic job! Thanks for posting up all the information and follow up, I think you have provided valuable feedback on those who follow you that install a Volvo O2 sensor. Or at least may convince them to pay the $500!

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