What diagnostic system are they using and what fault codes are they getting?
I'd be taking it somewhere else if they've had it ten weeks and cant fix it. Sounds like they've no idea what they're doing, just fitting parts and doubtless charging you a fortune.
Are you sure it's the immo, not something daft like the autobox park/neutral switch or a broken earth?
What garage is it at?
What actually happens when you turn the key,i.e. does the fuel pump run, any dash lights flashing, does the engine turn over, if so does it sound the same as normal etc?
freddie
May 2009