E92 335D 2008 Dpf Warning Help Needed

[Dayo]

hi, i bought a 2008 335d about 2 month ago. after 1 month of driving to and from work i get the particulate filter message coming on the idrive screen. no loss of power

i got my mate to code read and it brings these codes up.

present 43D1 DDE Throttle valve actuator activation

present 4530 DDE Charge air pressure control diviation

present 4D00 DDE exhaust back pressure sensor

not present 4667 particulate filter system

present 480A particulate filter system

not present 49E7 throttle acuator

present 481A particulate filter system

after a full code clear, i take it for a 8-10 mile drive and the particlate filter warning doesnt come back but flags these errors codes.

present 43D1 DDE Throttle valve actuator activation

not present 4530 DDE Charge air pressure control diviation

present 480A particulate filter system

present 4D00 DDE exhaust back pressure sensor

we forced a regen, and drove 30-40 mile at 60mph. checked on scanner and it said it had regen.

1 month later, particulate filter warning on again.

exhaust back pressure is reading 35mbars at idle, 60-70 when reving in neutral. 100mbars cruising at 60mph, and about 800mbars when thrashing it

can anyone shed some light on this?

thanks