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      01-11-2013, 05:31 AM   #16
Second Lieutenant
Mustard3's Avatar
United Kingdom

Drives: F31 340i
Join Date: Sep 2011
Location: UK

iTrader: (1)

In my first 7 months of ownership I never did notice a re-gen. The exhaust tips were always spotless.

The reason was it wasn't doing a re-gen because the back-pressure sensor had failed, which over time started to cause a significant drop off in power.

I had the sensor replaced and a forced re-gen, which took a couple of attempts by
PMD at Chelmsford.

The exhaust tips now get reassuringly sooty, but I can't say I'm ever aware of any signs of a re-gen taking place except for the occasional 'eggy' smell.