Rear pdc genuine retrofit?

stevec

Member
Hi all.
Just acquired an almost complete genuine audi pdc kit to retrofit to my A2.
Parts i have
4x pdc sensors 4b0919275 (3 pin) 23mm diameter
Control unit
Rear bumper loom
Spare undrilled rear bumper(pdc marks clearly visible)
Rear beeper
Parts needed.
Loom from control box to cluster (kufatec)
Sensor mounting brackets

Right now here's my question.
Is there a special bumper cutting tool 23mm to fit these sensors? I see sealey make them in various sizes but unable to find a 23mm one.
Or a 23mm hole cutting drill?
Thanks Steve
 
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mcauleyj

Member
Definitely get a punch for doing the holes - much better than a hole saw.
I used a VAG one, 18mm for the wifes Alhambra OEM install, worked great,
For my A2 I installed a set of flush mount aftermarket sensors and used a 16.5mm punch from Amazon - it worked well too.
 
Very timely, doing the same as you. Have a bumper with PDC and hoping to fit to mine. Got a 23mm hole saw but seen comments. Will look for punch.
 

stevec

Member
Very timely, doing the same as you. Have a bumper with PDC and hoping to fit to mine. Got a 23mm hole saw but seen comments. Will look for punch.
All the hole punches for rear pdc sensors i have seen are slightly oversized. If you find an oversized 23mm (23.2 etc) hole punch please post up part number.
If your donor bumper has genuine Audi sensors can you please accuse measure hole size in bumper?
 
All the hole punches for rear pdc sensors i have seen are slightly oversized. If you find an oversized 23mm (23.2 etc) hole punch please post up part number.
If your donor bumper has genuine Audi sensors can you please accuse measure hole size in bumper?
Will do, i'll check tomorrow.
 

mcauleyj

Member
All the hole punches for rear pdc sensors i have seen are slightly oversized. If you find an oversized 23mm (23.2 etc) hole punch please post up part number.
If your donor bumper has genuine Audi sensors can you please accuse measure hole size in bumper?
That's a good idea, the OEM VW sensors that I installed using the OEM 18mm punch fitted easily in the holes.
The 16.5mm sensors in the 16.5mm hole were a little tighter to fit than I remember the VW ones being.
In fairness I neither measured punch nor sensors in both cases, in hindsight it might have been better to do so especially for the aftermarket ones.
 

Rusty911

A2OC Donor
These are known in the trade as Q-Max hole cutters.

Vast range of sizes.

Edit, I see one of the sizes is 22.5mm.
 

stevec

Member
These are known in the trade as Q-Max hole cutters.

Vast range of sizes.

Edit, I see one of the sizes is 22.5mm.
Thank you.
I have measured the diameter of the genuine audi sensors with a set of digital vernier calipers, and it is exactly 23mm. I think I'm Going to need at very least a 23mm hole punch.
 

2work

A2OC Donor
Steve, as per PM earlier,

I have a hole cutter which cuts the hole 0.5mm smaller than factory. The OEM sensors fit in beautifully and snug.

Soon as I’ve finished mine in the next week or 2 I can send it onto you for return once you've finished.

It took me a while to find this size without having to purchase a massive set for over £150.

Kind regards,

Tom
 

stevec

Member
Steve, as per PM earlier,

I have a hole cutter which cuts the hole 0.5mm smaller than factory. The OEM sensors fit in beautifully and snug.

Soon as I’ve finished mine in the next week or 2 I can send it onto you for return once you've finished.

It took me a while to find this size without having to purchase a massive set for over £150.

Kind regards,

Tom
Thank you Tom. I will look after it and return it.
Steve
 
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