wrote:
> I have a 1991 Legacy sedan with around 116,000 miles on it, and the
> check engine light recently came on. After hooking up the test
> connector, I was able to make the light flash DTC 22 at me, indicating,
> according to the repair manual, a problem with the knock sensor that
> could result in the car defaulting to 'fail-safe' timing mode. Now, it
> seems pretty clear that the first step would be to replace the knock
> sensor, but I don't really have time to do that this week, and it would
> be nice to keep the car in service for short trips to the store, etc.
> So, my question here is a three-parter:
> 1) Is there anything I should try before yanking the knock sensor?
> 2) Is it safe to drive?
> 3) This can't be an indication of engine knock, right? Or would this
> trouble code also manifest because of the beginnings of an engine
> knock?
>
> I appreciate any ideas anyone might have....
>
> -V
>
I THINK you may only suffer decreased performance and MAYBE also
slightly worse fuel economy. If you clear the code by disconnecting the
neg. term. of the batt., step on the brake pedal, wait for - say -
20-30, reconnect; and the code immediately is set again - yeah, it's
likely a real code for a bad knock sensor. If it doesn't come back, it
could've been some kind of fluke I guess. Do check for corroded ground
and wiring/connector problems in case re-seating a connector or
something fixes it.
Carl
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