Scan with a) xiaotec "850 OBD-II" Android app, or b) Vol-FCR or volvo850diag programs on Windows.

Report here any DTCs for COMBI (ECU 51) and/or ABS (ECU 01).

For "850 OBD-II" app, post its Summary here -- it's the first part of the 850log.txt.

In my USA '98 S70 GLT, the fuse controlling OBDII diagnostics (and climate control) is small fuse #5, 15A, in the Supplementary Fuse Box (that has slots for 36 small fuses). Supplementary Fuse Box is under the hood, in the USA driver's side corner, very close to the windshield. The lid of the Supple...

**************************************************** volvo850diag v0.9 is now available! **************************************************** There is a new volvo850diag v0.9 version (dated 2019-07-14) available for download as: https://jonesrh.info/volvo850/volvo850diag.zip It's the first update i...

Wayback Machine has a snapshot of .pdf that Ozark Lee's link pointed to.

(deleted after typo in previous post was corrected)

Esperado, Here's some info exerpted from a recent PM you haven't read yet (and which you and others might find interesting / useful related to your speedometer 15% off error, and the peculiarities of how your COMBI is programmed)... 0. The "850 OBD-II" V1.3.4 app reports your present clust...

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 an ...

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.

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] - Sc...

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...