I know the thread is pretty old, but the problem is not, so why opening a new thread?
I had the problem, that my speedo was totally off, not showing anything till 80, then suddenly showing 100, going up like exponentially, till it showed 200, when I was only going 120. I could verify the real speed via nistune and GPS, so I knew, the sensor was ok.
I can add a few numbers, because I desoldered all the brown capacitors and measured their capacity. Here is the PCB, I am referring to:
C3 = 100nF
C10 - C11 = 120nF
C13 = ? (physically broken)
C14 - C18 = 47nF
C20 = 47nF
C21 = 0.8nF
Values rounded to the next one available as a cap.
They don't seem to have all the same values, and by the way, I also think, 1206 are the correct ones: 3.2mm x 1.6mm
C10 and C11 having different values than C14-C18 is fine, because they are parallel caps to the pairs of X1, X2 annd Y1, Y2, you can see that when following the copper.
The most suspicious one to me is C21 with its really low value, while I expect C13 and C21 it to have the same values as C14-C18, because they all connect pins of the IC to ground.
@banandana, could you assign the 5 values of yours to the specific caps they were coming from?