Audi Adblue Issues - P20BD Reductant Heater Circuit - Engine light on Audi Q5 2.0L TDI 

I was swinging on the Sofa on your workshops background music😁 Great video Rob. Spot on Diagnostic procedure!

Bravo👍, Great video Bro, this could be quite a challenge without DDTSB, but you fixed it👍 DiagnoseDan has made a huge improvement to our community by compiling all this info & making it available just few clicks away👍 Thanks for sharing Bro, Stay Safe👍

Great Video. The resistance value is now added to the existing TSB and so is a link to your video.

Nice one Rob!

man, same issue I had a few days ago with an VW Tiguan. good work

Thank y veru much

I have the same issue. We pulled the heater element plug and there was power. What would be the next thing to check?

In cases like this i like to make a note of the Known Good components resistance so in the future i can prove the fault before getting the part with decade box.

Just question , if we use anti cristallisation is that will resolve to problem or we have to do what you done

hello do you have the reference of the wiring to change? THANKS

nicely done! do you happen to know what is the heater element resistance value threshold? Would 2 ohm resistance trigger the circuit high fault code or not?

I am unable to get the heater element off the adblue pump

hallo wat is de referentie van het blad, bedankt

Adblue freezes -11°C, I live in a country that doesn't ever get that cold, so the heater never comes on. So I simply cut the two wires for the heater and soldered on a 8ohm 100w wire wound resister, a bit of heat shrink, $20 worth of parts, 2 hours of time. No problems from the reductant heater system that was 3.5 years ago... Save yourself a fortune. (I have an AUDI Q5 2013 2.0L CGLC DOHC 16v Turbo Diesel)

Wouldn't mapping out the adblue solve this?

Hi.white îs p20b900, p148b00 Code. Thenk you .from Rumania

Hello , so I have the same problem with my Q5 and at tha garage they told me to change all tha adblue tank . Can you , plase , tell me what did you used for your car ? The name of the product or some informations of how can I solve the problem? thank you !!