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I'm no p-car expert....
...and that's why i take my car to the dealership...but i've heard that the motronic system is fairly sophisticated and that there are many "layers" (for lack of a better term) that the deraler boxes can read and interpret that the handhelds cannot...in other word...you may get emissions system reading from your handheld where a dealer box might tellyou exactly where to go within that system...
...for $100 bucks, you didn't waste your money, at the very least, you have the direction of the fault when you walk into your dealer...
...goodluck on the magnitude!
Cheers,
--troy
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