I have getting an engine warning light for the fuel additive control module on my 2010 1.6 diesel mazda 3. I am at my wits end with this issue. Changed the control module and the fuel additive tank and the issue is still there. I bought both of these items second hand so that might be the issue. It also comes up with a error for fuel additive tank level circuit. I can't remember the code. Has anybody advice or what to do next? It is going on months and I just want the see the end of this lol