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B1 is the Climate Control
2-1-1 = Drivers side damper motor position sensor: open circuit or short circuit to supply voltage
3-2-5 = Recirculation camper motor active too long
4-1-4 = Pasenger compartment: drivers side sensor intake fan blocked
4-1-7 = Passenger compartment passenger side sensor intake fan blocked
Search on messages from me and you will find some very helpful comments on this subject
You might also order the Pocket data booklet from Volvo It has all the codes and a great deal more to help you maintain your volvo
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