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Yes, I am familiar with the system having only 1 injector. It can cause the need for more regens if the NOx sensor aka bank 1 sensor is reading wrong. Same as if the pdf pressure tubes are blocked. That sensor being bad can cause it.
Another problem that can cause it is a turbo going bad. Do you have the ability to start the regen and monitor the pressures of the turbo boost and the temps of the regen system? If so, activate the regen and see if you are building first at above 1400 degrees, than above 1800 degrees. That is the lowest threshold for the temps. If you are not getting that, then the turbo is not sending down enough pressure to get the temps up.
What codes did you have before? Also, do you have the VIN so I can pull the checklist off IDSS and get it sent to you?
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