Question about Kia Rio

4 Answers

When idle I hear a tap sound like every 20-30 seconds or so. Would replacing the spark plugs and wires help eliminate that noise? I did a OBD scanner and I get the Knock Sensor Circuit Malfunction

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  • 2 more comments 
  • Joseph Murphy
    Joseph Murphy Mar 27, 2011

    On a 2002 Kia rio is it screwed into the engine block? What kind of screw? Do I have to remove any covers to replace the knock sensor?

  • Joseph Murphy
    Joseph Murphy Mar 27, 2011

    Ok but how do I remove it from the backside of the engine? What kind of screw is it? Do I have to remove the intake manifold support bracket? If so, how do I do that?

  • Joseph Murphy
    Joseph Murphy Mar 27, 2011

    P0325 Knock Sensor circuit malfunction

  • Joseph Murphy
    Joseph Murphy Mar 28, 2011

    For the knock sensor circuit, is there a fuse involved or do I reseat the connector for the knock sensor? Where do I locate the knock sensor circuit?

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4 Answers

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  • Kia Master
  • 5,370 Answers

You have to replace knock sensor.The procedure is as follows:------- The knock sensor is located on the back of the engine, if you reach over the top to the backside you can feel it. Helps to have a helper under the car to see it from the back side, and from the top you can pull the plug and route the new one Knock sensor. You shouldn't have to remove anything to get to the sensor, but it may make the sensor easier to reach. If you have changed out sensors on a vehicle before and have a set of sockets or wrenches, you should be able to easily change the Knock sensor.---------------- The knock sensor is located under the intake manifold and must be changed from underneath the car. If you remove the oil filter it is directly above it and is in clear view once the oil filter is out of the way. The connector plugs in behind the intake manifold air breather on the top side. If you remove the air breather cover it will help you get to it.take off the air cleaner assy and on the back of the engine by the fire wall under the exhaust manifold you will see a wire coming up going to a connector thats the knock sensor one bolt that holds it on the engine and unplug it to remove knock sensor. See fig below:--- When idle I hear a - helpmech_105.jpg
To remove:

  1. Disconnect the negative battery cable.
  2. Remove the intake manifold support bracket.
  3. Disconnect the sensor connector.
  4. Remove the sensor from its mounting.
To install:
  1. Installation is the reverse of the removal procedure.
  2. Tighten the sensor to 12-18 ft. lbs.
-------------- This will help.Keep updated.Thanks.Helpmech.

Posted on Mar 28, 2011

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  • Kia Master
  • 17,129 Answers

It need not necessary be related to the spark plugs since the plugs fire only when the HT triggers and it seems to work at all times. The fault seems relative to the firing timing and so the electronic unit or the sensor must be checked. It can be the the impulse triggers are absent from the sensor but if according to your observation the fault seems well timed as an oscillation, then the possibility that the electronic circuit is a suspect.
If however your plugs were not replaced and the engine has clocked well over 50000kms, then replacement of the plugs and wires will only be good to clear the doubt.

Posted on Mar 28, 2011

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  • Kia Master
  • 15,557 Answers

What was the exact code that you got from the obd scanner?
IF the knock sensor circuit is bad then the PCM could be trying to adjust for a percieved ping and causing the noise that you hear. The replacement of spark plugs will not do anything to remedy the problem.
There are two good sources of information on this:
One is www.kiatechinfo.com and you can make a free account and see everything that you could ever want to know about that car.
The other one is www.Autozone.com and you make a free account and put in your make and model and then you can access all the repair information for free. THis is like a haynes manual.

Posted on Mar 27, 2011

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  • Master
  • 3,530 Answers

Welcome to Fixya

Replacing the spark plugs and wires will not help. Knock sensor is used to detect engine knock or detonation (there is a piezoelectric element inside the sensor). The signal from the knock sensor is sent to the PCM/ECM and that is used to control the engine's timing.

Possible cause of this are:

  • The knock sensor is faulty and needs to be replaced
  • There is a wiring short/fault in the knock sensor circuit

  • Check the resistance of the knock sensor(compare it to factory specs). Check for broken/frayed wires leading to the sensor. Replace the knock sensor is necessary. Here's the picture of the knock sensor. You will see this screwed into the engine's block or cylinder head.



    When idle I hear a - elix0411_23.jpg
    Thank you for using Fixya!

    Posted on Mar 27, 2011

    • 1 more comment 
    • Jose Cada
      Jose Cada Mar 27, 2011


      The knock sensor is located on the back of the engine, if you reach over the top to the backside you can feel it. it is attached be two screws and you will have to undo the plug at one end. Takes about 10 min to do it. Helps to have someone under the car to see it from the back side and you (on top) can pull the plug and rout the new one. Please see picture below:




    • Jose Cada
      Jose Cada Mar 28, 2011

      It is located under the intake manifold and must be changed from underneath the car. If you remove the oil filter it is directly above it and is in clear view once the oil filter is out of the way. The connector plugs in behind the intake manifold air breather on the top side. If you remove the air breather cover it will help you get to it. You need to use 13mm or 12mm wrench.

    • Jose Cada
      Jose Cada Mar 28, 2011

      see picture below for the exact location of knock sensor.




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