Steve Shrimpton

Hi there, new to the forum and I'm looking for some advice in the hope that someone has had the same issue I have and is able to provide some guidance to diagnose.
2015 Q5 Sline 2.0TDI. I currently have an EML on and when scanned with OBD reader I get fault code P20BD. (Vehicle still drives and performs fine with no other issues).
After looking this up online I have hopefully pinned it down to the AdBlue heater open circuit.
My question is, does anyone know what/where should I be starting/checking to confirm it is definitely the heater within the tank before stripping down and replacing an expensive part i want to rule out any simple fixes. i.e. what pins should i be checking on the wiring looms etc for power or continuity?
Any help would be greatly appreciated.

AngusSA

Hi Steve,

I simply cut the two wires to the reductant heater and soldered on a "4ohm 100W wire wound resister" <- very important detail. Used my ODB2 scanner and cleared the P20BD fault. It's been 12months now and no problems.
The resister looks like the heater coil to the Q5's computer... I have the same car (diesel).

Finally I have asked the local Audi mechanic what the heater does and why is it there. Google seems to confirm this.
"The heater is for countries where the Adblue will freeze (-11 degrees celsius). I live in a country where a temperature that low is very unlikely."

Barraged

12 degrees Fahrenheit

lalitswain

is it still fine for you? I want to get this done. I cant do it, need some technician to do it.