I own a 2008 Mazda 6 2.0-litre diesel with 77,000 miles. A little while ago a DPF warning light came on and the car went into 'limp' mode. I spoke with the Mazda dealer who suggested the DPF filter required replacement, along with other items that may or may need replacing, cost between £2,600 - £3,500. After talking to a few people the car went to an independent garage who said they could do it for a lot less. £700 later the filter apparently was replaced, but he could not get the car from limp mode - in other words nice try but no banana, and £700 down the pan. I then went back to Mazda for a vehicle diagnosis. They claimed the filter was 38 per cent blocked, well beyond regeneration, and the original quote stood. Please help in any way you can.