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1994 850 How to read B codes

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

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Year and Model: 850 Wagon 1994
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1994 850 How to read B codes

Post by a061469 » Fri Apr 19, 2019 11:21 am

I have a 1994 Volvo 850 Wagon Non-Turbo. I check my A codes fairly regularly but I have never checked my B codes. My questions are, can you check B codes, and if you can, how do you check B codes? As you can see in the attachment, the A side has a light and a button, but the B side has neither. I've tried putting the jumper in the B side and pressing the button on the A side, but the light never lights. Anybody able to check for B codes? If you do, how do you do it?
Volvo A & B.jpg

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Re: 1994 850 How to read B codes

Post by RickHaleParker » Fri Apr 19, 2019 11:59 am

Are you holding the button down long enough?


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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