What is a knock sensor???

1. user_28436 Established Member Joined: Nov 2008 Shropshire Posts: 1786

   #1 31st July 2009, 18:24

   The engine management light was on so iv just had a diagnostic done and it came up with knock sensor. What are they and what do they do? Also how much would a new one cost?
   Matt
2. sammy-spoiler Infrequent Poster Joined: Jul 2009 Because race car Posts: 143 more than 84bhp

   #2 31st July 2009, 18:34

   senses knocks obvsly...
   
   
3. user_28436 Established Member Joined: Nov 2008 Shropshire Posts: 1786

   #3 31st July 2009, 18:39

   Thanks for that....
4. LeeM Saxperience Post Whore Joined: Feb 2008 Liverpool Posts: 7393 Black Corsa C SRi

   #4 31st July 2009, 18:39

   senses knocking and adjusts fueling accordingly i believe. i would like some confirmation where this is on a vts, is it at the back on a mk1 and in the combined plug at the front on a mk2?

   1 user thanked this post: user_28436
5. Thecherry0121 Established Member Joined: Dec 2008 Great Barr Posts: 1489 Cherry red 106 GTi

   #5 31st July 2009, 19:20

   mk 1 vts i believe is at the back of the block half way up as said above for its purpose
6. JordanTaylor L-plater Joined: Mar 2009 Posts: 40

   #6 31st July 2009, 19:36

   Knock sensor is a sensor in the engine that listens for un-recognised knocking noises and turns your engine managment light on.
   Usually incase theres some of your piston rings/valves have came off and knocking in side your cylinder :]]
7. nickwillyhams Infrequent Poster Joined: Feb 2009 Stoke-on-Trent Posts: 247 2000 16v

   #7 31st July 2009, 21:48

   listens for det and knock yeah an adjusts timing & fueling to suit
8. VTRelite Saxperience Forum Bum Joined: Dec 2008 Gloucester Posts: 3000 Citroen Saxo VTR Renault 5

   #8 31st July 2009, 23:29

   I was told that it 'listens' for pre-ignition