Diesel with critical parts

I surrender! In the last 4 or 5 months I have paid over $9000 for all the diesel dreaded necessities, diesel particulate filter,AGM,footwell module, etc. All brand new and installed at New London Connecticut BMW. All functioning. But, the engine light is back on! I'm 79 years old and I can't take it anymore. If anyone might want to take advantage of my surrender, the worst expenses are past , the car has been much loved for it's comfort and power. It has a spare tire with a jack, trailer hitch, and roof rack. Present repair estimate is around $4000 for failed heaters in the Diesel exhaust tanks.