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02-09-2010, 12:42 PM | #1 |
Scooby Newbie
Member#: 201827
Join Date: Feb 2009
Chapter/Region:
International
Location: Latvia, Riga
Vehicle:1998 Impreza GT Blue |
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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02-09-2010, 01:46 PM | #2 |
Scooby Specialist
Member#: 128582
Join Date: Oct 2006
Location: Eastern, PA
Vehicle:2010 Impreza 2.5 Wgn 2011 Nissan Juke |
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. |
02-10-2010, 03:36 PM | #3 |
GC84Ever
Super Moderator Member#: 301
Join Date: Sep 1999
Chapter/Region:
NWIC
Location: WA
Vehicle:1970 FF-1 & '70 Van 02 WRX/01 RS |
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. |
02-10-2010, 03:59 PM | #4 |
Scooby Newbie
Member#: 201827
Join Date: Feb 2009
Chapter/Region:
International
Location: Latvia, Riga
Vehicle:1998 Impreza GT Blue |
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. |
02-10-2010, 04:17 PM | #5 |
Scooby Specialist
Member#: 128582
Join Date: Oct 2006
Location: Eastern, PA
Vehicle:2010 Impreza 2.5 Wgn 2011 Nissan Juke |
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. |
06-29-2022, 09:48 AM | #6 |
Scooby Newbie
Member#: 498320
Join Date: Feb 2019
Location: NYS
Vehicle:2005 Saab 9-2x Aero Red |
I think this thread is a good resource for the DIYers using NASIOC for reference or answers to questions. The knock sensor is used to detect preignition and/or detonation that cannot be audibly heard by human ears. I think the knock sensors should be replaced every 100k but most don't replace until they fail.
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