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[hoofing it]

Hey its so nice to help someone!...  Any ideas how you check a turbo?  Car is running great  (156k miles) and delivering 45.3 to the gallon on average of 8-10 mile trips, but have noticed a whistle from the turbo as it cuts in lately?

When lots of smoke come out the rear
Joking aside just remove the intake pipe at the turbo and feel for up/down/side to side play and in /out play.
Best way to look after one is regular oil changes

[dave9000]

Been away to the sea last weekend, 350 mile round trip, no more problems with turbo or lights, even the MPG has improved.

As for checking the turbo, without taking it apart the only thing I think you can phisically check for is play in the turbo spindle. ( just take the air intake off and you can see the end of the spindle and vane, should move freely but have no play in it). I may be wrong but I dont think there should be any noticeable play in it. As for the whistling, mine did that from the day I got it at about 73K only had problems now over 130K