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i have a saab 93 tid 2004 which keeps generating p1900/p1901

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the problem always occurs after going on the motorway for 20 mins plus, smoke pours from the rear until I stop and start again.no problem on short journeys . have spent 1000 pounds on engine , plus timing belt changed. can you help??

Vehicle: 2004 saab 93 tid 1.9

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