Quote:
Originally Posted by Carl n Susan
DEF that is old, kept in high temps or sunlight, or freezing temp has its effectiveness reduced significantly. The consumption is not affected. The SCR in modern light duty trucks introduces a fixed amount of DEF per unit of diesel fuel. Burn more more fuel (i.e. towing) and you consume more DEF. The SCR doesn't know or care about the quality of the DEF. Nor is there onboard NOX sensors to determine if the DEF rate is reducing the amount of NOX. The only way to test the effectiveness is via a Smog check (be sure to ask Volkswagen how they handle this situation).
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Actually my RAM Cummins has TWO NOx sensors in the exhaust stream.