quattro digest, Vol 1 #4573 - MC 2 knock sensor failures

[Larry C Leung]

Graham,

My knock sensors failed one at a time. If you're on a real
tight budget, buy the 1-2 knock sensor and try in both
positions and see if you can knock off [ ;-) ...] which one(s)
are bad. IMHO, the ECU may be fooled, but I'd be willing
to bet that they're both bad.

LL - NY





> Date: Wed, 5 Feb 2003 17:59:36 +0000 (GMT)
> From: Graham Thackrah <gthack at geog.ucl.ac.uk>
> Reply-To: Graham Thackrah <gthack at geog.ucl.ac.uk>
> To: quattro at audifans.com
> Subject: 2142 and 2144
>
> Hi list,
>
> First time out in my car (uk 1989 100 tq MC2) for 2 months this
> morning
> after a few (!) jobs that I needed to do on it (none
> engine/fuel/ignition
> related) and it started feeling quite sluggish, pulled the codes on
> returning and it chucked out 2142 and 2144, in that order, meaning
> the
> sensor on cylinders 1 and 2 is faulty and possibly the one on 3,4,5
> too.
> Anyone out there know if, after replacing the first sensor (after
> checking
> out the wiring and seating of that sensor are alright first) the
> code for
> the second is likely to disappear? Or, if both codes are stored, and
> the
> wiring+seating of both sensors is good, then is it likely that both
> sensors are faulty?  My dealer won't have either in stock (ok, they
> *might* but if they do I'll eat my air con compressor) so I'll have
> to
> order them, I'd just like to know how likely it is both sensors are
> bad?
> If I order the first one and then need the other it'll just end up
> taking
> ages so if they are both highly likely to be bad then I'll order
> them at
> the same time.
>
> Still, after 2 months off the road, it did feel great to be back in
> the
> beast again. And when the knock sensor problem is sorted I intend
> to
> investigate the limits of the new RE720's thoroughly:)
>
> Cheers in advance,
>
> Graham,
>
> 1989 100 tq