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    Is it dangerous if the reductant heater in my 2013 Audi Q5 is broken?

    Audi Audi Advice Audi Q5 Audi Q5 Advice Audi Q5 2013

    It is dangerous for my 2013 Audi Q5 if the reductant heater is broken? I don't have any alarm on my screen, but my mechanic told me that it is broken.

    Answered by CarsGuide
    5 February 2024
    David Morley

    The reductant heater on this car is a heating element that stops the AdBlue from freezing. According to most sources, the heater is only called into operate at ambient temperatures of minus-11 Celsius or lower. So, unless you're a regular at Australia's snowfields, your car will probably never need this function. But while the car may work perfectly without a functioning reductant heater, you might find that it's technically unroadworthy on the basis of its emissions systems (of which the AdBlue is a part) are not all working properly.

    Most times, failures of this heater revolve around the electronics that control it, but when that happens, the computer will usually flash up a check-engine light to let you know there's something wrong. Without this light, I'm unsure why your mechanic would think there's a problem with the heater system.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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