Hi All,
My A3 recently starting making a ticking sound coming from the HPFP at low revs (below 2000 rpm), I guess at higher the sound is covered by the engine sound, also the sound only comes when the engine is warm.
Also the car drives fine as I do have any of symptoms such as loss of power, engine misfire etc...
I had the car diagnosed by garage specializing in diesel injection who told me they didn't really have an answer to give me as they were confused themselves as for what was causing the sound.

* They used the computer to check the pump's readings and they all match the manufacturer's values.

* They have removed the pump's head to inspect it (even with a microscope) and it was clean (no metal bits)
* The tried to disconnect the plug from the head and the sound was gone (which a I guess is a good sign as the pump being driven by the cambelt keeps rotating, meaning it doesn't seem to be anything wrong with the pump internal components rotating and obviously confirm there is no metal bits inside the pump), so they have replaced the head with a new one and the sound was back again... this what go them confused
* They only thing they have found faulty was that the fuel filter hasn't been changed since 2013, so I asked then to replace it thinking that could be the issue there causing the pump to work extra-hard but I have been driving a good 100 miles (city and motorway) and the sound is still there

So they told me I could either replace the pump but that would be an expensive bet (about £1200 as you need to replace the cambelt as well) as they couldn't guarantee it would fix the sound or I could go to have the car diagnosed by Audi to see of there is a software update (i.e. see if something needs to be done on how the head sensor and the fuel rail sensor communicate) but I am not really sure about that one as to me Audi will just tell you to change the pump and won't really bother investigating.

So here I am in a situation where either I change the pump, i go to get the car diagnosed by Audi or I just live with that sound, i mean the sound doesn't bother me at all I just want to make sure that ticking doesn't mean I will ending up having to change the whole injection system.

What do you think guys ? have you experienced that ticking sound with your car ? what did you do about it, live with it or replaced the pump ?

Thanks in advance for your replies.

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