Why does my diesel VW Caddy idle at around 1000rpm every 300km for several minutes, with no DPF warning lights? Could this be ...

My 2010 Volkswagen Golf 1.6 TDI had its emissions fix in January 2017. Prior to this, I've owned it for five years with no issues. Last week, a flashing glow plug coil came on now and then. Mechanic ...