Knock sensor

[Adam]

Does anyone know where the knock sensor is located i have a mk3 megan 15 dci i had it on a fault finding machine and it came up with knock sensor circuit failure

[Stranger]

Moved to the right forum

[Adam]

Im new to this what's the right forum

[Adam]

Moved to the right forum

Im new to this what's the right forum

[Stranger]

Moved to the right forum

Im new to this what's the right forum

No worries, this forum, the problems / questions forum is the right one.

You'll get more answers here 'cos not everyone looks in the welcome forum

[Stevie67]

I believe that Renault call the knock sensor on the 1.5 dci an accelerometer, if this is true I think it is the one that I have circled.

[Adam]

Thanks alot for your help once i unscrew it will anything leak out ?

[Stevie67]

I don't think so, but go gently in case you have to get it back in quickly

[triumph2.5man]

Adam, yes in some places it is called an accelerometer and others a knock sensor - baffling.
It is very rare for this sensor to play up. I have seen this come up on CLIP as a fault but took no action and the fault was never seen again. There is not a lot to this; no moving parts. First of all remove and check the plug and the wiring. A broken wire could trigger this fault. You will need a deep socket so check that the sensor is tight in the block. If it is loose, could cause the error message. Do not undo it for if you do, you will have to reset the Pressure regulation adaptives and for this you will need CLIP. Same if you fit a new one.
The instructions say "accelerometer circuit" (!!) other sensors may cause this to show a problem viz coolant temp, air temp, fuel temp. Atmospheric pressure.
As a matter of interest, what are the symptoms that caused you to have your car diagnosed in the first place?
Mike

[Adam]

I had my engine carbon cleaned in the hope the mpg would improve i never really get more than 46 mpg and they as part of the service run a test on it everything was fine except for the knock sensor circuit he tried to clear it but it wouldn't so i figured it cant be that much to replace but my Haynes manual does not seem to list it's whereabouts.