All the time it doesn't light up - be happy!
2015 OM states:
Diesel particle filter
light illuminates or flashes yellow.
The diesel particle filter requires cleaning. Continue driving until light extinguishes.
Illuminates during driving
Control indicator illuminates, accompanied by a warning chime, when the diesel particle filter is full.
Start cleaning process as soon as possible.
Flashes during driving
Control indicator flashes when the maximum filling level of the filter is reached. Start cleaning process
immediately to avoid damage to the engine. A warning chime sounds every 3 minutes until the cleaning
process is complete.
2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.