Basically you have to take off the intake pipe that's bolted to the turbo, grab the nut with your fingers and see if there is any shaft play. Up and down is bad, in and out a lot is also bad. You can get it rebuilt for about $400 or buy a new one for a little more. You can replace it yourself easy if you're handy with a simple ratchet. Another way to check would be to see if there's a lot of oil in the intercooler, but that's not as straightforward.
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1999 Saab 9-3 5-door Stg4
Philly Region SCCA
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