DPF Light flashing...Help!

Hello everyone. I need your help. I'm looking for a specialist who knows how to repair Mazda cars. I have a Mazda CX7 2.2D. The DPF light is flashing. I have already been to 3 specialists. Everyone has a different version. I have the code P2459. Dpf, it is not clogged. 1.service, lambda probe.2 service we have to do an investigation because we do not know.(found that there is pressure on the DPF) 3 service, we will rinse the DPF chemically and then look for further. I live around Manchester-Liverpool. If you know someone who really knows Mazda cars,PLEASE give me the address.

ps. My Mazda has driven 98,000 mi and the question was also whether they are faulty fuel injectors, I changed the oil myself and deleted the inspections from the steering wheel, I do not know another way. Thank you WALO
 
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