Cannot help with immobiliser problems but can you hear the fuel pump start
(under the rear seat) when you switch on ?
If nothing heard you might like to check the fuel relay (orange encapsulated
unit near the engine management unit <£5 new) or the pump itself.
All the best
I did hear of a similar problem with a 307 HDI, when it was delivered new.
The solution for that was to disconnect the battery for 10 minutes,
reconnect and try again. Something to do with the ECU getting its knickers
in a twist.
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