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Old 08-17-2010, 01:30 PM
Penguin Penguin is offline
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Location: Illinois
Join Date: Aug 2003
Posts: 1,924
Mein Auto: Z4 and X5 Diesel
Originally Posted by zimmerrk View Post
Could you fill the tank with water and would the vehicle start, or is there some advanced sensor that can determine that it is not merely the level of fluid but tests for ammonia content?

DEF is available widely, such as at many parts stores (AutoZone, Advance Auto, NAPA, etc.) VW dealers, Ford dealers, Dodge dealers, and almost all truck stops. It typically cost less than $10 a gallon.

"Sensors in DEF tanks will notify the driver if volume is low or
if the product concentration is not of good quality. Another sensor will
indicate if the NOx level in the tailpipe exhaust is too high."

The EPA would not approve an SCR system which would allow the use of plain water.
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