Poor starting and white smoke 2.5 tdi A6

Ianb4310

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Hi everyone I've read lots of posts on this all seem to have same problem when left for a long period of time 4hrs etc car struggles to start it turns over fine but it like its not catching I let glow plug light go out then turn if I put glow plugs on a couple of times it's a little better not much but it always starts second turn ?<br />
After reading other posts seems it could be <br />
1 thermostat <br />
2 temp sensor<br />
3 maf<br />
4 glow plugs<br />
5 pump timing <br />
<br />
I'm going to replace temp sensor first as its cheapest and easiest could someone please post a picture of exact location <br />
Car is a 2002 A6 2.5 tdi<br />
Thanks<br />
Ian