I have a 2004 Volvo 630 With 565 ISX Engine. Recently I started to get low air warning from secondary air tank. the fact that the preassure read out drops to 0psi and than comes back to previous Preassure before the drop with in a second leads me to think that it may just be the sensor or wirring to the sensor. Where on my truck are these located? is it the ones under the tilt steering pedal on the firewall? if so which one? or do I have to start unpluging them till I come accross the second air tank sensor?
PS My first post on here.
thanks in advance