DPF sensors are used in the exhaust system of your car, and are only found in diesel cars. DPF stands for Diesel Particulate Filter. A DPF system will tryi to minimise the amount of soot being emitted from the exhaust, therefore lowering emissions. If the car has smoke coming out of the exhaust at an incresed rate, then the DPF sensor could be faulty and need to be replaced.
