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Just had the emissions fix on my Golf - is a faulty DPF sensor the start of many more problems?

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 told me to do 60mph in fourth gear for half an hour, which I did on the motorway, even though almost all its mileage is motorway apart from five minute morning and afternoon school runs. The flashing coil still came up the next day alongside a catalytic converter light. I took it to Volkswagen and they diagnosed a faulty DPF sensor. Is this the start of many problems, am I to expect EGR failure and clogged DPF soon? I'm wondering if I should cut my losses and sell it.

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The fix creates more soot and a worn EGR valve and ageing DPF have more trouble coping with it, so more likely to need a new EGR than a DPF sensor.
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