You are buying a Used Ignition Control Module (aka Transistor Unit, Ignition Amplifier, power stage) Bosch p/n 0 227 100 124 
will fit the vehicles in the list below.
This part also have other applications, please check the compatibility chart provided. Refer to pictures and match your numbers before you order or when in doubt please call us,
we will be more than glad to help answer your questions about this and other parts for your Volvo or other European model using Bosch ignition system.
Ask and buy with confidence, I'm a Volvo mechanic w/ more than 30 years experience.
With us  your satisfaction is always 100% guaranteed or your money back no questions asked. This is our policy.
This part carry a 6 Mo. warranty  starting the day of purchase. Our  modules have been cleaned and  tested.

Question- What is the ignition amplifier function?
Answer- In simple terms, the ignition amplifier amplifies the signal from the ECU to the coil.
The following is a diagnostic of a failing amplifier:
No start, Car will start then die, stalls intermittently, hesitation under load, Misfiring, fluctuating tachometer

Fits Volvo, Porsche, Saab, Peugeot
Click on view compatibility for your specific year and model