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      05-03-2012, 04:38 AM   #63
briers
Ben
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Drives: Tesla p85d
Join Date: May 2010
Location: Midlands,UK

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As you did the motorway trip and it reached a high enough temp for a regen to take place the thermostats aren't really the problem here.

I do short trips too, usually once every tank or 2 I take it on a longer journey or m-way and within 10 mins it holds onto a gear, rpm stays around 2k in D mode, it's that at 70mph anyway. The temps go from 84 to about 92c and the mpg goes from 50 to 30.

It doesn't sound like this happened for you.

I would leave it in D when trying to force a regen. In 4th its over revving on the motorway and using incredibly light loading which isn't going to generate enough heat.

Only option left is dpf cleaner.

Out of interest have these short trips been daily and for how long / how many tanks?