Vauxhall Zafira whirring engine noise

Car: Vauxhall Zafira
Variant: Zafira Club 1.7CDTI
Model Year: 2011
Categories: Engine & Drivetrain
Hi, I just noticed a constant whirring sound coming from the engine all the time it's running. It goes from a low tenor sound to a high soprano sound and back again. Sounds like a revving noise. Any ideas on what it might be, please?

Thanks!
Posted: May 27, 2015 (9 years ago)
Probably the DPF regenerating which is normal .Check this link for further explanation (see Symptoms of active regeneration section )

http://www.theaa.com/motoring_advice/fuels-and-environment/diesel-particulate-filters.html
Posted May 27, 2015 (9 years ago)

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