In May my 2009 BMW X5 35d popped on a check engine...

In May my 2009 BMW X5 35d popped on a check engine light after about 4 hours of driving on the highway. I had the code scanned at a local shop and they told me it was for a NOx sensor but I was okay to drive until I could get into the shop. After returning to Denver I made an appointment at Schomp and the next day I had a warning light that came up stating "incorrect DEF fluid installed 200 Miles till no-start" I watched the miles count down as I had 4 days until my appointment. After three days that warning message went away but check engine light still on. Took car in for appointment, service advisor stated these can be very difficult to figure out and I stated no worries, take you time. About four days later I got a call my vehicle was ready. I went and picked it up and was told the technician re-calibrated the sensor and performed a "regen" on the DPF. They did not charge me and told me it was under the emissions warranty. AMAZING!!!
Fast forward to the very next trip I take, drive for 4-5 hours, turn vehicle off and on re-start CHECK ENGINE LIGHT. Same driving cycle as before and low and behold same code. After about three weeks I was finally able to get it back to Schomp BMW for them to re-address the concern. I dropped the car off and about three hours later I got a phone call from the service advisor and he stated in a very condescending tone, "you know it is going to be $149 to look at your car, right?" To which I replied. "why is that, you have already looked at it for the same concern in which case I was not charged, and now a month later I have to pay for this?" He then told me that he wasn't sure why I was not charged and I should be thankful for that. I went down to the dealership to pick up the car at which time I advised to the writer my apprehension with paying for something that another advisor told me they can't really figure out. After about 10 minutes I agreed to pay the $149 if it meant they could tell me what was wrong with the car. Two days later I received a call asking if I had installed non BMW def fluid. Which I hadn't, but it was filled at my last service by a shop with AD_BLUE DEF which from my understanding is OEM fluid. Another day goes by and I receive a call stating car was ready and they drained, tested and refilled the def fluid and did some testing and light is off. Pick up my car and invoice reads verbatim "INTEROAGATED AND FOUND 2 FAULTS PRESENT 436D AND 4D35 RAN CORALATING TEST PLAN FOUND ALL ACTIVATIONS WORKING REMOVED METERING MODULE AND CHECKED FOR CONTAMINATION FOUND NOTHING CHECKED DOWN PIPE FOUND CLEAN. THEN PERFORMED THE FLUID QUANTITY TEST FOUND GOOD AT 30ML. RECEIVED DIAG CODE TO RESET LONG TERM ADAPTATIONS. PREFORMED SERVICE FUNCTION THEN CLEATRED FAULTS TEST DRIVE FOUND NORMAL OPERATION. DRAIN DEF FLUID AND FILLED WITH FACTORY FLUID. IF PROBLEM PERSIST RECOMMEND NOX SENSORS AND PROGRAMMING"

Other than a plethora of grammatical issues this paragraph tells me- WE FOUND NOTHING WRONG, WE DID NOTHING LUCRITIVE TO ADDRESS YOUR PROBLEM, WE HAVE NO IDEA WHAT TO DO AS THIS IS AN ONGOING PROBLEM........ PLEASE PAY YOUR $149 AND HAVE A GREAT DAY.

I then received a customer satisfaction survey in my email asking if I wanted a follow up call from a "Service Manager" to which I replied, ABSOLUTELY. Now 4 days after receiving the email and 5 days after getting my car back, I have received no phone call and drove 350 miles yesterday towards Buena Vista and my check engine light is back on again.

Hopefully not all service encounters are this way, as it was a very unforgettable experience.

Michael