Depends if the sensor/item in question is out of specification. If it is not, i.e. air leak, then no reader will be of use.

As pointed out above, these readers are generic, although some are better than others.

I use one in work (my own) that we use to diagnose faults and to extinguish engine management lights. Saves us a fortune @ £35+ vat a time for someone to come round and do it for us otherwise.

Also, 3 of the lads @ the dealer where I work have these ones I recommended as well as they are just as accurate @ what they do as the Vauxhall ones and normally access the data quicker as well for some reason.

Obviously, they are restricted in that they cannot work on airbags, etc... or programme keys like the dedicated ones can, but, will work for what you want.