I think The Guardian link is
Four more carmakers join diesel emissions row | Environment | The Guardian
The article suggests that in real world driving the cars in question emit more exhaust pipe nasties than while undergoing a controlled test in the lab. This is not a revelation at all - I think any car (petrol or diesel) would...
What sets VW apart is the engine management system seems to have two distinct profiles - one for road and one for the lab - with the lab profile set specifically so the car would 'pass'...
- Anthony
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