Mercedes Clean Diesels Won't Start When Urea Runs Out

Written by Russell Sturmey

Monday, 20 October 2008 10:40

Mercedes With the new clean diesel law coming into effect, manufacturers have come up with ways to mean the new standards. One way is by using NOx traps to capture the NOx. Another is to use urea injection to convert the harmful NOx into less harmful gases.

Mercedes BlueTEC diesels use the urea injecion method utilizing a tank of urea stored in the spare tire compartment. When a sensor determines that the tank is running empty of is contaminated, it will display a counter on the dashboard counting down from 20. The driver had until the tank reaches zero to refill the tank. Should they ignore the counter, the vehicle will not start.

And to answer your questions ... yes, urea is a component in urine, and no, peeing in your urea tank will not work.

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