Bluetec AdBlue Preheater Heater

Diesel Exhaust Fluid is stored in an external tank and injected into the exhaust pipe to react with the nitrogen oxides right before the selective catalytic converter. Because it’s stored externally, however, that means that it is susceptible to the elements.

If DEF is too cold, it cannot be injected into the exhaust. To keep this from happening, DEF tanks include a special heater whose job it is to keep the fluid warm enough to stay liquid. However, like all mechanical parts, this heater can eventually burn out.

Replace your faulty item with this direct replacement.

Part Fits the Following*

• M CLASS 2012 – 2016 W166, 03/12-01/16

*This is a guide only. If you are unsure if this part is suitable for your vehicle, please contact us and we can confirm prior to your purchase.