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Has it got a catalyst fitted? If so it could need replacing - expensive. Could be worth changing the lambda sensor first (about £30 from Euro Car Parts). Is there any signs of misfires? If so DI pack or plugs could be at fault. Also check compression is OK. Let us know how you get on
 

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Discussion Starter · #3 ·
took car to local Saab dealer. They cleaned up throttle housing, AIC valve and air flow meter connections. CO level down to 0.01% all for £28!!! Excellent news because I was expecting a large bill.
 
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