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Old 02-09-2010, 12:42 PM   #1
Arr
Scooby Newbie
 
Member#: 201827
Join Date: Feb 2009
Chapter/Region: International
Location: Latvia, Riga
Vehicle:
1998 Impreza GT
Blue

Default knock sensor

few days back i got a check engine message

made self test by connecting two connectors under panel
signal says its knock sensor (beep signals )

so ive got knock sensor glitch, so now i need to replace it,
but before i buy i new one
ive got few questions
1. how do knock sensor become dead? why?
how does it works?
can it be repaired?
thanks and sorry for my bad english
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Old 02-09-2010, 01:46 PM   #2
kev m
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Member#: 128582
Join Date: Oct 2006
Location: Eastern, PA
Vehicle:
2010 Impreza 2.5 Wgn
2011 Nissan Juke

Default

Most knock sensors are piezoelectric sensors - which mean they generate their own voltage. Basically the motion of vibration causes it to generate a current.

How do they go bad? How does any sensor go bad? Either something inside the sensor physically breaks or there is a problem with the harness.

They are not generally considered repairable, but you never know.
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Old 02-10-2010, 03:36 PM   #3
Subie Gal
GC84Ever
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Join Date: Sep 1999
Chapter/Region: NWIC
Location: WA
Vehicle:
1970 FF-1 & '70 Van
02 WRX/01 RS

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knock sensors are pretty much a wear item

they cannot be repaired

they should be replaced with a new factory part

and this is every easy to do.
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Old 02-10-2010, 03:59 PM   #4
Arr
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Member#: 201827
Join Date: Feb 2009
Chapter/Region: International
Location: Latvia, Riga
Vehicle:
1998 Impreza GT
Blue

Default

yeah, but day whene we checked check engine signal, then i called almost all latvians carpart shops - no one has it everywhere i have to wait about 4weeks to get it :/

weve got one nice subaru salvage store only subarus, there you can get also new parts - but they told day ago they sold last new knock sensor, now i have to wait about 3-4 weeks...
damn fuel consumption about 20liters/100km where check engine lights up

Last edited by Arr; 02-10-2010 at 04:10 PM.
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Old 02-10-2010, 04:17 PM   #5
kev m
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Member#: 128582
Join Date: Oct 2006
Location: Eastern, PA
Vehicle:
2010 Impreza 2.5 Wgn
2011 Nissan Juke

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Bummer - I guess if the knock sensor is bad the ECM may retard ignition timing so as to avoid possible damage to the motor if there was knock it could not detect.

Result = reduced performance/mileage.
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