MC2 knock sensors

LL - NY larrycleung at
Sat Dec 9 19:21:33 EST 2006

When I replaced the front knock sensor on my 200Q (MAC14) the stealer
I got it from only stocked the longer wired sensor. He said that the only
difference in P/N is the length of the cable. I am not sure what impact of
using a cable of longer length for the shorter cabled sensor would have,
but as you stated, since it is simply a microphone of relatively high
impedence, I'm not sure that the added resistance of extra cable (low
impedence) would add up to much effect at all. Of course, then you're
stuck with finding a safe way of coiling the excess cable.



On 12/9/06, Huw Powell <audi at> wrote:
> > The family lists 2 KS's for the MC2, but does not tell me which is
> > which. both of mine have a brown rubber boot on the KS end and white
> > connectors (inc white plugs in the loom). Family album says that they
> > should be brown or green (no mention of white).
> > Since a KS is basically a microphone are the 2 KS's different parts
> > with different thresholds / dynamic ranges or are they both the same
> > and just at different locations (listening to different cylinders)?
> It is my understanding (crosscheck this) that they are the same, and the
> use of two allows the ECU to determine which cylinder is actually
> knocking, so it can retard the timing on only that cylinder.
> The two KS's are different, again I am not certain here, because the
> wires aren't the same length.
> Maybe someone who knows they have two correct parts can chime in and
> tell you what's on their car.
> --
> Huw Powell
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