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noise after update the turbo cooling pump #2

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Old 06-05-2019, 05:41 PM
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Default noise after update the turbo cooling pump #2

Hi,
This is what happens with my 2016 Q5.
I noticed that since the turbo aux coolant pump update, I hear a noise like a "TOC" when the car reaches 20 to 30 km/h. The noise occurs at each start (after a stop or red light) and it seems to come from the front left, but i'm not sure.
The dealer heard the noise and he thinks that it comes from the ABS system. He told me that they tried four Q5s and they all make that noise. I remain skeptical with this explanation.
I know that the new Q5 2018 and up, there is a noise (three TOCs) that comes from the ABS, but the noise in my car is new.
Do you have this kind of noise in your Q5? if not, any idea?

Last edited by amine; 06-05-2019 at 06:02 PM.
Old 06-05-2019, 06:14 PM
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Originally Posted by amine
Hi,
This is what happens with my 2016 Q5.
I noticed that since the turbo aux coolant pump update, I hear a noise like a "TOC" when the car reaches 20 to 30 km/h. The noise occurs at each start (after a stop or red light) and it seems to come from the front left, but i'm not sure.
The dealer heard the noise and he thinks that it comes from the ABS system. He told me that they tried four Q5s and they all make that noise. I remain skeptical with this explanation.
I know that the new Q5 2018 and up, there is a noise (three TOCs) that comes from the ABS, but the noise in my car is new.
Do you have this kind of noise in your Q5? if not, any idea?

What is a "TOC"?
Old 06-06-2019, 04:14 AM
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Hi Bob
it's a kind of «knock». Just one knock, when the car starts moving.
regards

Last edited by amine; 06-06-2019 at 04:17 AM.
Old 06-06-2019, 01:59 PM
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amine no they don't all do that.Who's your dealer ? I'm in Quebec too.
This is going to sound nuts but based on your description I'd say step #1 check the wheel nuts for proper torque.
Old 06-06-2019, 02:58 PM
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Hi Murray,
it's audi lévis.
can you tell me please what is the right torque for this model?
regards
Old 06-06-2019, 05:39 PM
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ok, I found it : 140 Nm (105 lb-pi).
Old 06-08-2019, 07:31 AM
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Hi
the torque is ok!
I check again and no idea of the origine of this noise
Old 06-10-2019, 05:47 PM
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Hi guys
I raised the car and found that the Bushing of the Front Control Arm seems to be broken (see the picture).
Do you think it could be the source of the Kocking sound from the front of the car?
regards

Last edited by amine; 08-16-2019 at 04:35 AM. Reason: more accurate information
Old 08-16-2019, 04:52 AM
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Hi guys,
I am always looking for the source of this knocking noise. Have you ever heard of this technical service bulletin ?
regards

Old 08-16-2019, 05:35 AM
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Regarding the TSB I had the same on my S6, but it was more of a knocking rattling over slow speed bumps, but not a single knock then fine. They indeed had to replace the curved lower control arm to silence it.
I did however have a loaner MKII Q5 and newer A4 that had the ABS click/knock whatever it is and yes that is annoying.
I also had a faint knocking rattling coming from the rear and it ended up being the rear brake calipers...they get looser as the pads wear...an unfortunate design flaw but one without a fix or TSB, after pad replacement the noise went away.
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