I had a Corsa1.3 cdti and the EGR valve choked up. Dealer wanted £300 plus VAT, I got the part and got a local garage to do it for £170 cash.
The Corsa was doing high miles too so it wasn't all town driving.
A friend at work had Astra 1.9, 150bhp version and the EGR valve went good style, white smoke trail down the main road the lot. It spent more time in the garage than the work car park.
The EGR issue can't be left if the light comes on even if it seems of OS running fine because it means you are pumping red hot exhaust gases through the turbo when they should be re-circulated with cooled exhausted gases from the EGR first. This if left causes higher engine head temperatures which could lead to premature head gasket failure. The other issue would be turbo failure due to the oil in bearings being burnt so it won't lubricate the floating bearings.
It's not just GM engines that have failures, Ford and VW have had issues. Due to the technology involved now to meet emissions reliability has took a knock it's the luck of the draw now. You may get a good one or not, full service history is a must and look out for engine repairs under warranty lots will mean you may end up digging deep in the future.
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