Not Starting

[nonsuch]

2005 tdi . Somedays it fine . Other doesn't start its not the battery that's fine when I turn key I get nothing & it seems the immobileliser is still on . If I wait or turn key from position 1/2 lotts of times this sometimes works & it will start .when I turn car on & it won't start all elecs work apart from heated front windscreen (back work)when iItit does come on the car will start .anyone got any ideas thanks

[alz]

Hi, have a look at egr valve, mine went, giving the same problems as yours, did a temp fix with blanking plate, then had it fixed, cost me loads!.