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I'd never owned a diesel-engined car before I bought my pre-registered 2005/55 Volvo V70 in March 2006. It's a delight to drive: a real mile-eater, and very comfortable. But at the time I bought it I'd never heard of problems such as particulate filters and the dreaded Dual Mass Flywheels. It's entirely thanks to your columns that I now know these problems exist. The particulate filter aspect I cope with by always using the air conditioning. But I have no idea whether my car has a DMF. The Volvo main dealer from whom I bought the car described it as a 2.4D (Euro III) SE 5 door, with a maximum engine output of 163bhp @ 4,000 rpm. From this description, can you please tell me whether or not it has a DMF? If it has, is there any mileage or age when any problems are likely to show up?

Asked on 26 September 2011 by GB, Maldon, Essex,

Answered by Honest John

If it's manual it will have a DMF. If it's torque converter automatic it doesn't need one. Running the air-conditioning will have no effect on the diesel particulate filter. The DPF is part of the exhaust system. I think you are confusing it with the cabin pollen filter.

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