Some have gotten it scanned to find out it was a bad Nox sensor. Well I called the closest VW dealer to go get it scanned and it was behind me back in Katy, Tx. I turn around and drive an hour back the wrong way, just before getting to the dealer the warning light goes out!!! Kyle S. A.S.E. certified master auto technician, All makes, All models licensed smog technician, test and repair, L-1 advanced engine performance certified Certified Volkswagen technician, 2003,2004,2013,2014,2015 Volkswagen and Audi independent 12 years 2015 Jetta Comfortline. May 15, 2016. #1. Check Engine Light comes on with two codes: -P20FA - Control Circuit for Reductant Pump 2: Open Circuit. -P218F. My car indicates only 200KM left until "No Start" and I've topped up the system with as much DEF as it will take. After shutting off, leaving in Accessory power for a minute and several Press the blue forward. arrow on the bottom right again. 5) Now double click on status of basic settings and Operating instructions both will move to the selection box on the right. Press the blue forward. arrow again. 6) Verify engine is running, no pedals are pressed, vehicle in park, emergency brake is pulled, all doors and hood must be closed. The Adblue injector is pulsing from 12-50% depending on the throttle, and the pump seems to be running around 12%, and the adblue tank is registering as full still. I took it for a 50km drive, and no new codes showed up. Everything seems to be working fine. The Adblue countdown is still going though! Now down to 160kms. Sometimes, the reason why your Volkswagen check engine light is on is simply due to a loose or cracked gas cap. This can cause fumes to release in LaGrange, which will signal this warning light for you. Remove your gas cap, and screw it back on tight; if this doesn’t turn off your light, chances are there is a larger issue that needs attention. Reset procedure not working. I'm trying to help a friend out with her 2012 Passat TDI because the "won't start in x miles" hasn't reset despite draining and filling the adblue tank with VW fluid. She's left it KOEO for 30 seconds. She took it to the dealer and they said she needed to flush it and refill it (I assume they mean drain which she did). Had the AdBlue warning come up. Filled 10l of AdBlue, followed the reset procedure. Hoped it'd go away after a few days. Didn't and topped up a bit more. Still had the warning. Went to the express service and they spent some time troubleshooting. Apparently some regulator or sensor had hung/stuck. 11/07/17: NHTSA ID: 10122984 TSB ID: TT 26-15-04 Tech tips: selective catalytic reduction (scr) system repairs and adblue light reset procedure: 11/07/17: NHTSA ID: 10122985 TSB ID: TT 27-15-01 Tech tips (no crank, no start after cold soak issues): concern may be the result of a leaking vacuum check valve not holding residual pressure overnight. this results in a hard brake pedal that may As a guide, a Volkswagen Tiguan SUV and Passat family car have a 12 and 13-litre AdBlue tank respectively. The rate at which it is consumed depends on the size of the car and the driving style; the more economical the car and driver, the slower it will be used. C2ga.