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Ok. So how old is going to be the question there. If you have a DPF in your exhaust system then it may cause problems with self regeneration. BMWs use the EGR to increase combustion temperature to carry out the regeneration cycle so it may not work. As far as “ setting “ the EGR range to zero I’m not sure how you’d go about that without being able to change the software. In the normal diagnostic software the EGR range is set by upper and lower limits being reached. If the EGR reaches a limit too soon ie when the valve is blocked or jammed then it reports it as a fault.
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