Garage now says it is the knock sensor (not so sure). What is that and what does it do? Car is running fine with plenty of pick up and no pinking that we can tell. If that is replaced and light still comes on, any ideas about what else could be the problem.
2007-03-16 16:54:50 · 5 answers · asked by Anonymous in Cars & Transportation ➔ Car Makes ➔ Subaru
Where are you getting it scanned? If the knock sensor needs replacing then do it. But are they 100% sure. It could be the gas cap to threaded on right it could be an O2 sensor. Does the car have a smell of gas or rotten eggs(sulphur) It could be the catalytic converter. All those will make the check engine light come on.
2007-03-17 04:58:22 · answer #1 · answered by ? 7 · 0⤊ 0⤋
The knock sensor retards the spark if preignition takes place. Preignition, or spark knock, is when the fuel air mix ignites too soon, before the piston has come to the proper place at top of the cylinder. Preignition is often incorrectly called "valve noise" because it sounds like tapping valves, except it doesn't happen all the time.
The knock sensor is like a small microphone (usually a pietzo-electric pickup) that "listens" for spark knock. If it detects it, the computer will retard the spark a bit to prevent it.
Read my article http://econofix.com/igntime.html for more info
2007-03-16 16:59:25 · answer #2 · answered by econofix 4 · 0⤊ 0⤋
Gtb Legacy
2016-12-14 13:35:31 · answer #3 · answered by mosen 4 · 0⤊ 0⤋
Get a Haynes Repair Manual at the local Auto Zone or auto parts store in your area. It will troubleshoot and show you how to fix your vehicle. Also on the Auto Zone site has a section for vehicle maintenance. Go to any auto parts stores that do free engine checks though. Too many times the mechanic wants to stiff you for a job not really needed.
The book is the best bet. Here is for the ignition light on.
http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagResultsInfo&Parameters=Instrument+Panel|~36|~Driving|~22|~Ignition+Light+On|~107|~Looks+Like|~2&FROMJSP=type
This is the price for the knock sensor
http://www.autozone.com/servlet/UiBroker?UseCase=C001&UserAction=performSearch&Parameters=Auto+Store%7C%7EREGULAR+PARTS+LOOK+UP%7C%7EKnock+Sensor
What it is used for is when you are driving and a female starts acting dumb and irritable. Then you push this button it will knock some sense in her, aka knock sensor for short.
Here is the URL for what a knock sensor does.
http://www.autoshop101.com/forms/h38.pdf
And for another 10 points I will clean your windows too. lol
2007-03-16 17:13:56 · answer #4 · answered by Big C 6 · 0⤊ 0⤋
9 times out of 10 it is a O2 sensor. When your light is on your car is running in want is called limp mode and may not get the best gas mileage
2007-03-16 16:59:31 · answer #5 · answered by Anonymous · 0⤊ 1⤋