Volkswagen has been rocked by another emissions scandal, that could impact on motor tax levels.
This time the car maker's admitting that carbon dioxide emissions have been underestimated on 800 thousand of its cars.
It mostly affects diesel models, but for the first time some petrol vehicles are also included.
VW is already struggling with a major scandal over software installed in diesel cars to cheat in tests for nitrogen oxide.
Motoring Editor with the Irish Independent Eddie Cunningham says the company has been up front about the latest problem:
