Does anyone know which of these pipes I should use to add DPF cleaner?

 

I don't see any pipes in the picture.

Sorry, there are two pipes coming up and attaching to the bottom of the sensors.

3 hours ago, Davis_XI said:

Does anyone know which of these pipes I should use to add DPF cleaner?

 

Hi neither, if its running Adblue  take the spray head off and pour it in the hole if not there is an EGT sensor near where the top of the DPF is use that as any thing near the turbo can suck it in to the cylinders and lock the whole thing up, the problem with the way you are going to try is that the exhaust gas is going up the pipe and the cleaner can be sucked in to the sensor.

Steve.

I’m not running Adblue, it’s a 2016 A3 sline 8V 1.6 TDI.

Edited December 21, 2025Dec 21 by Davis_XI

15 minutes ago, Davis_XI said:

I’m not running Adblue, it’s a 2016 A3 sline 8V 1.6 TDI.

Should it be ?  Pretty sure post 2015 all TDI use ad blue. 

After an evening of trawling the internet, I think I’ve found the answer. The right-hand sensor in the photo appears to be the exhaust pressure sensor, while the other is the DPF pressure sensor, which should have only a single pipe connected to it.