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1995 850 Oxygen sensor replacement

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Vanishing
Posts: 2
Joined: 4 August 2011
Year and Model: 1995 850 GLT
Location: Canada

1995 850 Oxygen sensor replacement

Post by Vanishing »

I have my emissions light on my dash lit and am looking to replace the o2 sensor, however I have no idea whether it's the upstream or downstream one. Any suggestions on how to check?
I was kind of tempted to just replace upstream and hope for the best, but any help would be great.
I guess also, any advise, tips or warnings before I change it? I've replaces o2 sensors before, although my last one only cost 10$ not 110, so maybe a different can or worms.

jblackburn
MVS Moderator
Posts: 14043
Joined: 8 June 2008
Year and Model: 1998 S70 T5
Location: Alexandria, VA
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Post by jblackburn »

Don't throw money at anything until you pull the codes. You can use either OBDII under your coin tray or OBDI ports under the hood.
'98 S70 T5
2016 Chevy Cruze Premier


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!

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