FOLLOW UP: 13 golf wouldn't regen. Turns out the thermostat was failing to let engine reach proper temps to regen. New thermostat installed, covered by dieselgate warranty, issue free ever since.

MotoRad 7244-192 Fail-Safe Thermostat : Automotive

Thermostat Problem Maybe? SOLVED

2015 Jetta TDI CVCA heater hose issue round 3

Repeat DPF failure : r/tdi

2015 Jetta TDI CVCA heater hose issue round 3

Fuel & Engine, PDF, Fuel Injection

Car Mechanics, PDF, Headlamp

Thermostat Problem Maybe? SOLVED

In with the New (Part II) - The Truth About Energy

Vw golf overcooling - thermostat fault