PDA

View Full Version : Knock Sensor Error Code

HaLo
07-31-2002, 08:49 PM
Hi there,

I've checked my ECU error codes today and I got a code 34: knock sensor.  

A little later, I reset the ECU and did a little 2 minute drive and the code 34 didn't come on?

What should I do next?  Should I assume everything is fine (code 55) or that I have some sort of problem around my knock sensor?

If I do have a problem, should I change the whole part? Is it hard to change? How much is the part?  

I'd like your input.  Thanks a lot!
SSJ2Gohan
07-31-2002, 09:32 PM
I think you may be alright.  From what I understand the code will come back if there is a problem.

Everytime I clean my engine it puts the light on.  Says my O2 sensor went out.  So I replaced it.  Next time same thing.  Replaced again.  next time I finally caught on.  Reset my ecu and never saw it again.  Just cleaned my engine about a month ago and guess what?  It went back on!  This time I just ignored it and it turned off by itself (I think it goes away after 50 starts if the problem doesnt exist.
bbp
08-01-2002, 07:32 AM
The knock sensor is bolted to the engine and reads ultra high frequency vibration from the motor.  It senses the vibrations when the engine is experienceing pre-detonation and adjust the engine mangement to compensate.  The car will run without the sensor, it will trip a trouble code though.  The sensor is very expensive and does not like to be dropped, tapped on or anything like that.

It is insurance that a bad mixture doesn't tank the motor.
HaLo
08-01-2002, 10:59 AM
Ok... I checked again today and it gave me the code again.  

Does this mean it has to be replaced?
bbp
08-01-2002, 02:58 PM
it doesn't "have" to be replaced.  I think Ipriced them at over 150 bucks.  ask you dealer's tech.  see what they say.  i took mine out odf the race car, but we check the plugs quite often and run race fuel to prevent pinging.
HaLo
08-01-2002, 04:40 PM
Well... I asked the dealer.  They quoted me 172 C$ for the sensor.  He also said that it could be the circuit (wires) itself.  Does someone know where to start to check that circuit?

Also, would a faulty knock sensor reduce overall performance of the car?
Mtt22
08-01-2002, 04:53 PM
can someone how to check yoru error codes, or point me at a faq, 240sx.org is down so i couldnt check there.  Do you need a code reader?
HaLo
08-02-2002, 04:27 PM
Anyone?!