Possible Cause (Flow Too Low)
WARNING: This page is about a different car, the 1996 Volvo 850. However, it is still accessible from the selected car via links, so may be relevant.
- Defective PAIR system valve, pump relay, pump, solenoid valve, vacuum hoses or check valve blocked
- PAIR system air hoses/pipes blocked
- Open-circuit in PAIR system pump power cable or ground lead.