Will B-12 Cause Emissions Test Failure?November 5, 2017 bySolutions Central › Category: Choke › Will B-12 Cause Emissions Test Failure? 0 Vote Up Vote Down valvetube asked 2 years ago I treated a tank of gas in my 2007 Toyota Corolla with a can of Berryman’s B12. I have a CT emissions test scheduled tomorrow. The tank is about half consumed. Is there any chance the Berryman’s in the gas will cause an emissions test failure. Question Tags: Emissions Test|Treated Gas1 Answers 0 Vote Up Vote Down chemtooler Staff answered 2 years ago Typically, there will be no issues. However, if you’re deposits were severe, it is possible that the cleaning process could cause a temporary increase in emissions.