A DPF filter can become blocked over time. Potential causes could include a faulty sensor, incorrect engine oil, a failing turbo or most commonly the vehicle has undertaken too many short journeys where the filter’s regeneration processes has not been initiated. At first you may be alerted to an engine failure warning light and if ignored, the engine could switch to ‘limp’ mode. At this stage the vehicle will only allow you to drive very slowly with the intention that you’re to take the car either home or to your nearest garage for inspection and repair. If the DPF filter is blocked beyond repair then a new DPF filter can cost thousands of dollars, with premium cars costing upwards of $3500 ultimately wiping out any of the savings associated with owning a diesel engine over a petrol version. Regular cleaning of the DPF can maintain and significantly prolong the life of your filter and ensure you may never have to fork out a hefty sum to replace it. In the short term, a DPF clean can increase your vehicles power output, increasing speed, acceleration and responsiveness. As well as this, you can often expect a boosted fuel efficiency – the potential fuel savings could cover the cost of the clean over time! In addition to this, a clean will continue to serve its purpose which is to reduce harmful emissions, reduce engine noise and resolve RWC emissions failures. – That’s right, a blocked filter could easily lead to a failed RWC.