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    Cat 299d2 3516-18 ACU Catalyst Reagent Concentration Low

    Sorry I never replied with the solution. The DEF tank sending unit was determined to be bad and was replaced under warranty. I'm actually not sure of the part name, but essentially The whole heat transfer, intake, filter, level sensor unit that fits into the tank from the top of the tank. Took...
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    Cat 299d2 3516-18 ACU Catalyst Reagent Concentration Low

    OK. Thanks.
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    Cat 299d2 3516-18 ACU Catalyst Reagent Concentration Low

    Thanks for the quick reply! Why do you think the filter needs replaced?
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    Cat 299d2 3516-18 ACU Catalyst Reagent Concentration Low

    Fairly new machine with only a few hundred hours on it. It has been sitting for 3 months or so. Ran it today and got this yellow caution: 3516-18 ACU Catalyst Reagent Concentration Low The DEF tank show 3/4 full but I can't remember the last time I put any in there...does it go bad or lose...
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