Does the Air Pump (SAS) Really Do Anything?

My airpump has started to sound like a vacuum grinding up a cat. Of course, the noise only lasts a minute or so, then it stops and all is well. I guess I have 2 questions:

1. What does the air pump do?

I ask this because the car runs no different before the thing kicks in and no different after it shuts off.

2. If nothing changes regardless of this thing being on or off, do I actually need it? Can is be simply unplugged and ignored?

Some people may gasp and sputter at that last statement, this is an honest question looking for a direct answer…

SAS Delete/Removal Tutorial (No CEL!)

Sas delete on Volvos

IVIUSTANG » Yes, this does get rid of the P0410 code completely. erikv11 » The ECU doesn’t check the pump directly, it checks the relay and the solenoid (which you leave in place in this procedure), and it checks the O2 sensor voltage to see if it drops as occurs when the air pump is […]

Volvo Air Pump Fix Tutorial

If the air pump has failed in your Volvo, there is an alternative to buying an expensive new or used Volvo air pump: you can buy a rebuilt or used VW air pump and convert it for use in your Volvo.

A few questions arise when considering this course: Will the VW pump work right? How much will I save? Which VW pump part number(s) will work? How hard is it to convert? How do you do the conversion process?