Yikes! 4 grand... I hope not for your sake (or mine since I have this engine). I had a lower intercooler hose replaced due to an apparent leak, but without major symptoms.

If Gavin can't help, I'd suggest casting the net fairly wide in terms of a forum search. This engine was used in multiple VW, Skoda and Audi (maybe Seat too?) products over a long period of time and there will be a wealth of information about it out there.

Also, if it is replacement and the quote was from a dealer I'd consider looking to an independent and an alternative source for the part.

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Like this: Skoda Octavia 1.9L Brand New OEM Turbo Charger, 04-> | eBay That's $1,200 - $1,300 plus post. And they ship worldwide.

Second hand and refurb start from about $300 AUD on UK fleabay. Getting most of them to ship here could be tricky though. Then again you might source used or refurb here, from a VW/Skoda wrecker or specialist. What you do kinda depends on how long you plan to keep it, but $4k on a car that's worth what, $15-17 private sale or much less as a trade is a lot.