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[N61AOP]

My father has a 12 year old Saab 9-5 2.3 petrol automatic estate which has recently development an intermittent starting problem. About once a week it refuses to start, when he turns the key nothing happens. An hour or so later it will start, but that's not very helpful when your parked in a hospital car park! Does anyone have any ideas what the problem might be?

[AndyRoid]

Dodgy connector on the solenoid pack.
Dodgy gear selector switch.

[hoody]

does the engine turn over but not start,or just nothing,these can be prone to crankshaft sensors failing and di packs doing strange things,ignition switches are common problems on these too.

[omegod]

Second the ignition switch! Had it on a calibra whereby you would get the lights on the dash at position 2 on the ignition then bugger all when turning it for start. Had me chasing my tail thinking immobiliser but was a simple £8 switch.

[N61AOP]

Thanks for the comments. When he turns the key there is nothing, the engine doesn't turnover at all so it sounds like it might be the ignition switch.