IPD sale XeMODeX - Experts in Volvo Electronics
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

1998 Volvo V70 T5 O2 Wire Harness connectors

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

ryoung3300
Posts: 2
Joined: Sun May 17, 2015 4:16 am
Year and Model: Volvo V70 1998
Location: USA
Has thanked: 2 times
Been thanked: 0
United States of America
ryoung3300

1998 Volvo V70 T5 O2 Wire Harness connectors

Post by ryoung3300 » Sun Jan 21, 2018 10:07 am

I have a 1998 Volvo V70 T5 that my kid's drive around and we had to do some repairs, Turbo, exhaust, and O2 sensors being the main culprits via codes and visual inspection (exhaust). After rebuilding the turbo we are now ready to start putting the pieces back together. Well, when we disconnected everything I did not realize that we had disconnected the O2 sensors from their respective wire harness connectors. I have been researching for a few days and have not found anywhere that tells me definitively which wire harness connector goes to the Front O2 Sensor and which one goes to the Rear. One website had one connector number listed as the Rear, and another website had the other connector number as the Rear.

The connector numbers are: 3545972 and 3545970
I know that the sensor are specific to the front and to the rear and switching them can lead to all kinds of fun and my fun meter is pegged!

Thanks and look forward to your responses!

User avatar
misha
Posts: 4324
Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 56 times
Been thanked: 134 times
Serbia
misha

Re: 1998 Volvo V70 T5 O2 Wire Harness connectors

Post by misha » Sun Jan 21, 2018 3:16 pm

Black is for front and grey for rear o2.
These users thanked the author misha for the post:
ryoung3300
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

User avatar
abscate
MVS Moderator
Posts: 21109
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 318 times
Been thanked: 987 times
Trinidad & Tobago
abscate

Re: 1998 Volvo V70 T5 O2 Wire Harness connectors

Post by abscate » Sun Jan 21, 2018 3:24 pm

You will also pop a “ switched OXS” code if you swap them and have a code reader.

No big deal if you get them swapped in the driveway.
These users thanked the author abscate for the post:
ryoung3300
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

User avatar
wizechatmgr
Posts: 1345
Joined: Thu Jan 12, 2017 1:07 pm
Year and Model: 1999 V70 XC AWD 2.4T
Location: Albany, NY area
Has thanked: 23 times
Been thanked: 58 times
Contact:
United States of America
wizechatmgr

Re: 1998 Volvo V70 T5 O2 Wire Harness connectors

Post by wizechatmgr » Mon Jan 22, 2018 12:58 am

ryoung3300 wrote:
Sun Jan 21, 2018 10:07 am
After rebuilding the turbo we are now ready to start putting the pieces back together.
How did that turbo rebuild go? Just bearings and seals or did you encounter additional trouble? I have one I am going to be doing this spring.
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~187k miles

ryoung3300
Posts: 2
Joined: Sun May 17, 2015 4:16 am
Year and Model: Volvo V70 1998
Location: USA
Has thanked: 2 times
Been thanked: 0
United States of America
ryoung3300

Re: 1998 Volvo V70 T5 O2 Wire Harness connectors

Post by ryoung3300 » Mon Jan 22, 2018 3:47 pm

Thanks for the replies! I will look again, but both connectors looked black to me. Roger the switched OXS” code! What is the saying, "If at first you don't succeed, try, try, again!".

As far as the Turbo rebuild I used the TD04HL Turbo Rebuild kit (Flat Back) from ARD. It worked like a champ and it helped that they had a you tube video. I just replaced the bearings and seals and did not upgrade it to a Super Back.
Thanks again!

Post Reply
  • Similar Topics
    Replies
    Views
    Last post