BEFORE you buy a throttle module that won't fix your problem -- Problems similar to yours have occurred enough for Volvo to offer a service solution. It's the wiring from the ECU to the throttle that is the problem. Here's someone on sweedspeed discussing the repair. Some replace from ecu to etm, other just splice in at the etm. Sorry I don't have the part number from Volvo handy.
https://www.swedespeed.com/threads/t...wiring.257161/
A replacement throttle module for your car (2002+ turbo) is plug and play - if you really want to replace yours, find a used one - they don't go bad.
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