VAG 5 digit code 19456 = P3000 and yes it does exist, fault is CAN data bus, instrumentation - glow plug warning lamp ( mil ) possible causes are
wiring, matching resistor in the ECM, basically means a resistor is down and system works like the O2 sensors ie: if the rear O2 sensor = the same resistance as the front 02 it throws a code that's just to explain how these systems work
