Is there not a diagnostic socket & jumper lead under the bonnet on this year?
My '94 850 had one behind the drivers headlight.
If not, as others suggest, make a flash code reader, I used a 12v led from Maplins (gone now), you'll have to search to find which pins to use on the obd socket.
Sounds more complicated to say but it really is easy.
Last edited by volvo again; Jul 22nd, 2019 at 15:59.
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