Question about 1998 Subaru Legacy

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We just changed the knock sensor on our 1998 subaru legacy and now the front hazard lights are on and won't turn off ?!? any ideas?

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Try unhooking one of the battery cables and leave it off for at least 20 minutes. When you hook it back up the computers should re-boot. That has solved problems for me with heater, interior lites, power windows, AC, day time running lites, power mirrors, CD player, and wipers on GM autos and S-10 PU and Dodge trucks. None of the switches are connected to the device they control anymore. The switch tells the computer to open the window and the computer send a signal to the window motor. When the computer gets confused strange things will happen or not happen. Of course you may have to re-set your radio stations.

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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1 Answer

1998 subaru legacy ,replace knock sensor


if the engine has a knock sensor it is attached to the block between cylinders on the outside.

Aug 02, 2014 | 1998 Subaru Legacy

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Hi, I had the knock sensor changed in my 1997 Legacy Outback by an independant shop. I drove it the one mile back to our house and was amazed at how quiet it was to not have the ticking sound! But, now...


free check engine code read at auto zone. we replaced a sensor 15$ our spark knock sensor is still out but ran fine for two years. a month ago lost power sputtered with ac on , turned out to be a spark plug wire 29$ set of four we replaced ours with one we had from another car runs great again

Jul 18, 2011 | 1997 Subaru Outback

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1998 legacy outback. engine light comes on & goes off sporadically, when on, it hesitates at takeoff & runs rough at low speed.


Knock sensor has gone bad most likely. I had the same problem with the same car and replaced the knock sensor. Fixed the problem. Very common with Subarus. It's an inexpensive part but it requires patience and small surgeon's hands to get to it and replace it. Lots of how-to articles on line.

Jul 07, 2010 | 1998 Subaru Legacy

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I need to change the knock sensor on my 1999 subaru legacy i need to know where it is located


are you sure it is bad. I had that code and I ran 91 octane with a bottle of sea foam the code went away

Oct 24, 2009 | 1998 Subaru Legacy

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Knock sensor 1999 Legacy 2.2


As far as there being no knock sensor on a 99 2.2 I beg to differ. I have a 99 legacy and just had a diagnostic done and mine is bad. If there is no knock sensor why would it say it was bad and why does Auto Zone, Advanced Auto and my local Subaru dealer sell them. Mine is located under the throttel body and they are rather hard to get to. No offence to who ever said ther is no knock sensor but maby you should recheck your information becuse I know there is a knock sensor since I just changed mine.

Jun 14, 2009 | 1999 Subaru Legacy

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1997 Subaru Legacy GT 2.5L


Check the knock sensor.

The light comes on when you climb a hill, accelerate quickly or do anything that advances the timing a lot and the knock sensor doesn't hear the knocks (pinging). The engine timing is not retarded, so you get a misfire.

The computer turns off the CEL if it sees the car start and run with no misfire of this nature 4 times in a row.

Aug 21, 2008 | 1997 Subaru Legacy

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