Need help with my friends 95 Millenia

It is a lady that I work with and I told her I would try and find some help since I am on a few different car forums ... well, she needs the following he also gave the prices for each :

-Crackshaft position sensor (His price, just parts: $72.60)
-TPS sensor (His price, just parts: $152.88)
-EGP Valve & Sensor (His price, just parts: $40.00)

The guy she brought the car to is going to charge her $550 total (parts and labor) to fix those problems. Is there an easier way about going at this? And is there a way to check the ECU yourself? I don't own a Mazda and I'm just trying to help a fellow girl with her car.
 
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