2004 Saab 9-3 turbo

Crank shaft position sensor replaced, terminals scrubbed cleaned and accounted for, noticed minor oil leak at turbo, but other than that, can runs like a top.

- Except for the random times the check engine light comes on and Saab goes in to that "beyond dangerous" Limp Home Mode..

Anyone else get an intermittent LHM issue?
Whats the cause / fix ??

No Dealer near me / wouldn't do that anyway, except I'm running out of ideas.

Thanks