I replaced my knock sensor about 1200 miles ago on my 1999 Forester and it seems
that it solved my P0328 check engine light on issue

My problem is that when I put use my OBD to see the I/M status, it reports that
the CATALYTIC is still not ready. The rest of the applicable status are ready.
How much more do I have to wait before I can bring the car in for emission
testing?


--- In Subaru-Tech@yahoogroups.com, "Nipper Dawg" <nipper.dawg@...> wrote:
>
> You need a knock sensor.
>
> If you can hear knock or ping, its too late to do anything about it. The
> knock sensor hears it before you do and adjusts the ignition timing to
> prevent it from hapeninnig.
> Knock sensors fail when they get loose in the hsouing, crack, or just age.
> A bad knock sensor can cause stalling and poor running.
>
> nipper
>
> On Mon, Dec 8, 2008 at 8:25 AM, Dave <nomorefyr@...> wrote:
>
> > Happly holidays group,
> >
> > On a 2002 Forester S Ive been getting the MIL on a regular basis and its
> > reading as P0328 - the knock sensor. The problem seemed limited to startup
> > until the engine got warm but recently has taken to highway driving and also
> > stopping at red lights.
> >
> > My initial thought was the sensor was responding to a brief rattle of a
> > heat shield or something from the undercarriage on cold mornings between 1st
> > and 2nd gear - cant really nail it down as I cant drive and feel under there
> > at same time .... I began to think the rattle was creating a knock-like
> > signal and the sensor was triggering. Now with it happening on the highway
> > and redlights Im not so sure.
> >
> > I have not been able to actually hear any knocking myself so I don't think
> > its legit engine problem. I ran a tank of super through and no changes or
> > knocking. I'm ready to say its the sensor gone bad but before I lay out the
> > $80 bucks or so does anyone have any other diagnostic tricks to see if the
> > sensor is gone bad or I actually have a problem.
> >
> > Only other notable event is a drop of approx 3 MPG since the problem
> > started with the MIL / P0328.
> >
> > Anyone else notice that after using a code computer to erase stored codes
> > and extinguish the MIL the car starts but stalls from low idle the first
> > time ? It then quickly starts right up and all is ok. Is this the computer
> > restarting itself after an erase and normal?
> >
> > Thanks much.
> >
> > Dave in NJ - 18 degrees today and the sensor lit right up on startup !
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>