I'd guess you most probably have a failing ABS module.

The bottom of 3rd image shows your 2 OBDII DTCs (that are causing the CEL / MIL light to come on) are both P0172.

Other forum members can help you with diagnosing possible sources of the P0172.

1. I have *not* seen any Engine ECU DTC codes for Low Oil Level or Low Oil Pressure -- not for 98 S70/V70, nor for 96-97 850.

2. However, I believe the 96-97 850 had the capability to detect Low Oil Pressure and communicate that to the COMBI as a DTC code.

That being said, in the ~6-7 years I ...

I've used BAFX, Scantool OBDLink LX, Scantool OBDLink MX+, and others.

Each of those 3 worked. However, the Scantool devices worked better than the BAFX (since my BAFX generated garbage somewhat more often).

I was extremely satisified with both OBDLink LX and OBDLink MX+.

If you'll only use the ...

In the volvo_850_diag_links.html page's section that involves
some flashing LED tool links
look for the grey background note titled "Parts used to create jonesrh's flashing LED tool".

That tool uses a 12V LED that has an in-built 680-ohm resistor.

If your LED does *not* have an in-built ...

xiaotec "850 OBD-II" Android app ($2) and appropriate ELM327 cable will also clear '98 V70 SRS codes.

You said you wanted to reset the SERVICE light. You already have an OBDII bluetooth. For $2 it seems like you would be willing to install "850 OBD-II" app, then test if your existing OBDII bluetooth tool will work with "850 OBD-II" app to reset the SERVICE light. If it does, then you'll also be able ...

If you have an Android device, you can use
xiaotec "850 OBD-II" Android app (available on Google Play) for ~$2 + ELM327-compatible Bluetooth tool .

Some ELM327-compatible Bluetooth tools I've used successfully with "850 OBD-II" app:
- ScanTool.net OBDLink LX BT [recommended]
- ScanTool.net OBDLink ...

I suggest you PM xanthefin and ask him for a recommended tool. Tell him you're from Germany, so he knows you are ordering from Europe.

eightfifty2x0,

To answer your question...
I think most USA '96-97 850 owners probably use a scan tool >= 1 time per year.
Since 2012, I needed to use a scan tool multiple times per year (while I owned my USA '96 850 T5 and/or '98 S70 GLT).

If your car has the in-cabin OBDII port, and if you have ...