You are ignoring a major error code. The EGR system. I suggest removal of the EGRs and have a damn good clean of them. Unfortunately your car has a DPF so you can't blank them off.
The MAF can still be at cause. These cars do 155k plus on mileage, but sensors do wear out.
My A8 is on 170k now and needs a new suspension ecu and parking brake ecu. Such is life on these cars!
Auto box fluid change is always a good thing to do problems or not.
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