MI16 knock sensor
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  1. #1
    al
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    Default MI16 knock sensor

    My knock sensor keeps bringing up the check engine warning light... and it is starting to give me the irrits. (it has been doing it for a year or more)

    Where is the bastard, and why would it be bringing up the error code?

    Also, what do they actually do? My car is always run on 98 octane petrol, so surely it shouldn't even need a knock sensor? The 205 engine doesn't even have one does it?

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    Is it possible to just unplug the thing, or bodge it into shutting up some other way?
    405 Mi16 - Sold - Now back
    205 Mi16
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  2. #2
    1000+ Posts Dave's Avatar
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    Quote Originally Posted by al
    My knock sensor keeps bringing up the check engine warning light... and it is starting to give me the irrits. (it has been doing it for a year or more)

    Where is the bastard, and why would it be bringing up the error code?

    Also, what do they actually do? My car is always run on 98 octane petrol, so surely it shouldn't even need a knock sensor? The 205 engine doesn't even have one does it?

    Is it possible to just unplug the thing, or bodge it into shutting up some other way?
    If you unplug it you will lose a lot of timing advance and therefore power, same as when the light is on. Check the torque on the bolt. Its on the front of the block next to the oil filter. Good luck,

    Dave


  3. #3
    Demannu-facturing! Demannu's Avatar
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    I'm 99% certain that the knock sensor will not bring the light on. The ECU light on the Motronic systems only comes on when something that is going to affect the emissions occurs, ie lambda, auto-richness control, canister purge valve, air leaks at intake or exhaust or AFM problems. Other problems it will log, but will not bring a light on the dashboard.

    What codes did you pull out of it?
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  4. #4
    1000+ Posts PeterT's Avatar
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    I'm 100% certain that a faulty knock sensor, or a missing knock sensor, will bring up a fault code and retard the timing. Power drops from approx. 80kW at the wheels to 65kW.

    '92 205 Mi16
    '90 Mi16x4

  5. #5
    al
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    It does feel different when the light is on, but it usually goes off again a minute or two later.

    I have had the code read a few times - i think it is 44 or something...

    Are they expensive to replace?

    And is should access to the oil filter in the 405 require the rad (or something) to be removed? I serviced it recently, and couldn't get to it with everything in place. (and my arms are less than massive...)
    405 Mi16 - Sold - Now back
    205 Mi16
    505 GTi

  6. #6
    1000+ Posts Dave's Avatar
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    Hi Al,

    re-read this thread, it has everything you need to know including pics. I think I managed to find a guy who could get replacement knock sensors for 80-90 bucks.

    Dave

    16v/mi16 knock sensor


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